Editor's Choice - Our Favorite Seachem Aquarium Water Treatments

1. Seachem Flourish Excel Bioavailable Carbon

User Ratings: 82 2

Seachem First Impressions

"I LOVE this product."

By the following morning, the water was clear of algae. Very good product for an unbelievable price. It took a couple of days to clear but it works. The top is a measuring tool as well which I was not expecting. If you have a freshwater fish tank, I highly recommend this product. In the morning I awoke with my fish at the bottom barely able to move. I love all of the API products, especially their easy to use test kits.

  • Seachem Flourish Excel Bioavailable Carbon
  • CARBON PRODUCTION: All plants require a source of carbon, and Flourish Excel is a great and convenient source of bioavailable organic carbon.
  • IRON PRODUCTION: Flourish Excel also possesses iron reducing properties, thus promoting the ferrous state of iron (Fe+2), which is more easily utilized by plants than ferric iron (Fe+3).
  • PHOTOSYNTHESIS: Plants must produce longer chain carbon compounds (photosynthetic intermediates). By dosing with Flourish Excel you bypass the involvement of chain carbon compounds, and introduce the already finished, structurally similar compounds.
  • TREATMENT: On initial use or after a major (> 40%) water change, use 1 capful of Flourish Excel (5 mL) for every 40 L (10 US gallons). Thereafter, use 1 capful for every 200 L (50 US gallons) daily or every other day. For smaller dosing please note that each cap thread is approximately 1 mL.
  • SAFETY: Flourish Excel is completely safe for fish, however if you have Anacharis in an aquarium in which you are dosing Flourish Excel, then it is recommended to use it every other day rather than daily.
  • Manufacture: Seachem
  • Editor's Impressions Of The Seachem
  • Treatment Effectiveness
  • Quality
  • Value For Money
  • Affordability

Seachem Final Thoughts

"This product is AMAZING!"

Fish seem healthy and active during use. I've using this for my betta for several years with every water change. I decided to pick it up once again and struggled mightily my first few months. I didn't purchase this for an aquarium. I decided to pick it up once again and struggled mightily my first few months. This only applies to the 1st application. Tim's cultures were obviously very alive and active.

Overall Score
4.7


(3223 Points)

Peoples Choice - Other Highly Rated Seachem Aquarium Water Treatments

2. Seachem Stability Fish Tank Stabilizer - for Freshwater and Marine Aquariums 500 ml

User Ratings: 87 2

Seachem First Impressions

"Wow my tank is so clear."

You need a source of ammonia to feed the bacteria which Dr. You need to buy an eye dropper for this. I have used this consistently since cycling my small sized fresh-water tank. This product is exactly what it says it is. If you're treating injured fins or introducing new fish, this is for you. I use mine for my beta fish in a 2 gallon tank and need less than a half a cap full. Now our fish have grown and we've added live plants.

  • Seachem Stability Fish Tank Stabilizer - for Freshwater and Marine Aquariums 500 ml
  • TANK STABILIZATION: Seachem Stability will rapidly and safely establish the aquarium biofilter in freshwater and marine systems, thereby preventing the #1 cause of fish death: "new tank syndrome".
  • TREATMENT: Stability is formulated specifically for the aquarium and contains a synergistic blend of aerobic, anaerobic, and facultative bacteria which facilitate the breakdown of waste organics, ammonia, nitrite, and nitrate.
  • BACTERIA GROWTH: The necessary conditions for the growth of Stability's bacteria strains encompass a very broad range. When other bacteria begin to die off (usually from high organic loads caused by the unknown death of an organism), Stability simply becomes more effective.
  • USE: Shake Seachem Stability well before use and turn off UV/ozone filter. Use 1 capful (5 mL) for each 40 L (10 US gallons) on the first day with a new aquarium. Then use 1 capful for each 80 L (20 US gallons) daily for 7 days. Fish and other aquatic species may be introduced at any time as long as dosage is maintained for 7 days.
  • SAFE: The bacteria employed by Stability are non-sulfur fixing and will not produce toxic hydrogen sulfide. Stability is completely harmless to all aquatic organisms as well as aquatic plants, thus there is no danger of overuse.
  • Manufacture: Seachem
  • Editor's Impressions Of The Seachem
  • Treatment Effectiveness
  • Quality
  • Value For Money
  • Affordability

Seachem Final Thoughts

"Never works."

One planted that has algae problem so bad. I tried it without the water change and really didn't make a difference. If either or both ammonia and Nitrite are above 1ppm do not add ammonia. I love all of the API products, especially their easy to use test kits. Its 9pm and the old cloudy water is now crystal clear! However if you want a stress coat, this is perfect. My filter including polishing element could not clear it up.

Overall Score
4.8


(3154 Points)

3. Seachem Flourish Freshwater Plant Supplement

User Ratings: 78 2

Seachem 116051606 First Impressions

"No argument from me."

I've used every product on the market and this is the most AMAZING MUST HAVE PRODUCT! This is my absolute favorite conditioner I have used for all my aquatic creatures. I even poured in extra to help with the healing. I swim 5x week and usually my suits last about 2 months. My filter including polishing element could not clear it up. I've used it for years with great results. 2nd day kinda noticed a slight change in water.

  • Seachem Flourish Freshwater Plant Supplement
  • SUPPLEMENT: Seachem Flourish is a comprehensive plant supplement for the natural freshwater aquarium, containing a rich assortment of important micro elements, trace elements and other nutrients.
  • ELEMENTS: In order to benefit your aquatic plants and help your freshwater environment thrive, Seachem Flourish contains calcium, magnesium, iron, and other important elements.
  • WATER TREATMENT: For best results, use 1 capful (5 mL) of Flourish for each 250 L (60 US gallons) once or twice a week. For smaller doses, please note that each cap thread is approximately 1 mL. Refrigeration is recommended 3 months after opening.
  • SOLUTION COLOR: It is normal for the color of Seachem’s Flourish to vary by batch as the solution color is dependent on the temperature at which the product was blended. This variation in color is of no consequence to the function of Flourish.
  • SAFETY: Seachem Flourish is safe to use for invertebrates such as shrimp, but is designed to be used in conjunction with other macro and micro-nutrient supplements in aquariums only.
  • Manufacture: Seachem Laboratories, Inc.
  • Product Dimensions: 6.1 x 1.3 x 1.2 inches; 8.82 Ounces
  • Editor's Impressions Of The Seachem 116051606
  • Treatment Effectiveness
  • Quality
  • Value For Money
  • Affordability

Seachem 116051606 Final Thoughts

"It was a viscous cycle."

I've always had a love for fish and had a few tanks when I was younger. I have a 5 gallon tank, so that number was waaaay too high for me. The live plants even looked like I just bought them. I decided to pick it up once again and struggled mightily my first few months. Initially this was used as a sample packet came with our aquarium. The difference is that he was going twice his normal speed. The afternoon I received this product I added half a dose to each aquarium.

Overall Score
4.6


(3034 Points)

4. Seachem Pristine Aquarium Treatment

User Ratings: 82 2

Seachem 001437 First Impressions

"My fish kept dying."

I've used API water conditioner before and it works well. I know you are going to worry about your fish DON'T they are fine. It has been 4 days and our beta is loving the clearer water. In my opinion there's nothing better. Initially this was used as a sample packet came with our aquarium. In the morning I awoke with my fish at the bottom barely able to move. This water conditioner is a life saver!

  • Seachem Pristine Aquarium Treatment
  • Performance driven at affordable prices
  • Made in the USA with quality materials
  • Field tested to ensure nothing but the best for your pet
  • 250ml
  • Manufacture: Seachem
  • Product Dimensions: 5 x 2 x 4 inches; 8.82 Ounces
  • Editor's Impressions Of The Seachem 001437
  • Treatment Effectiveness
  • Quality
  • Value For Money
  • Affordability

Seachem 001437 Final Thoughts

"I highly recommend!"

I swim 5x week and usually my suits last about 2 months. This came just in time for my water change day! 1st day, I put product in tank with Fluval Biological Cleaner for Aquariums also. I hope it makes the swimsuit last longer. This worked really well for my tank. I hope it makes the swimsuit last longer. He started making bubble nests again which ne never did when it was super cloudy.

Overall Score
4.7


(1901 Points)

Honorable Mentions - More Top Selling Seachem Aquarium Water Treatments

5. Seachem StressGuard Slime Coat Protection - Stress and Toxic Ammonia Reducer 500 ml

User Ratings: 86 1

Seachem 116052306 First Impressions

"Just fly around the tank."

It's a must for anyone who loves Goldfish. I'm interested to see how long it works. Now our fish have grown and we've added live plants. Fish possess an antioxidant defense system to reduce the negative effects of ROS. I wanted to see if it would take the chlorine out of my swimsuit. Boy, I thought I was having trouble with my filter. Yes I know, they aren't supposed to live that long and no I can't prove it.

  • Seachem StressGuard Slime Coat Protection - Stress and Toxic Ammonia Reducer 500 ml
  • Premium slime coat protection
  • Promotes healing in wounds
  • Will not coat resins or clog filter
  • Protein active colloids
  • Reduces stress when handling or transporting fish
  • Antiseptic for fish
  • Promotes healing
  • Marine and freshwater
  • Manufacture: Seachem Laboratories, Inc.
  • Part Number: 075435
  • Material: Cotton
  • Item Weight: 1.15 pounds
  • Product Dimensions: 6.6 x 2.4 x 2.3 inches
  • Size: 500 ml
  • Color: Original Version
  • Batteries Included?: No
  • Batteries Required?: No
  • Editor's Impressions Of The Seachem 116052306
  • Treatment Effectiveness
  • Quality
  • Value For Money
  • Affordability

Seachem 116052306 Final Thoughts

"Suggested buy!"

It's water change day so I did this step first then started cleaning the tank. No exaggeration-- literally cleared overnight. I use in a freshwater aquarium and works well. I'm interested to see how long it works. I have been battling cloudy water in our small aquarium for two months. This is the 5th since I put in the product and my tank is crystal clear. I hope it makes the swimsuit last longer.

Overall Score
4.8


(1277 Points)

6. Seachem Stability Fish Tank Stabilizer - For Freshwater and Marine Aquariums 250ml

User Ratings: 85 2

Seachem 116012607 First Impressions

"Suggested buy!"

DON'T just wait everything will be fine. I love it when a product does what its supposed to. This came just in time for my water change day! I'm sold on this, I've tried SO MANY and wow. I'm sold on this, I've tried SO MANY and wow. 4-5 squirts in a sink of water, soak my suit 10 min, wring out and hang to dry. Makes me want to get more aquarium's, lol.

  • Seachem Stability Fish Tank Stabilizer - For Freshwater and Marine Aquariums 250ml
  • TANK STABILIZATION: Seachem Stability will rapidly and safely establish the aquarium biofilter in freshwater and marine systems, thereby preventing the #1 cause of fish death: "new tank syndrome".
  • TREATMENT: Stability is formulated specifically for the aquarium and contains a synergistic blend of aerobic, anaerobic, and facultative bacteria which facilitate the breakdown of waste organics, ammonia, nitrite, and nitrate.
  • BACTERIA GROWTH: The necessary conditions for the growth of Stability's bacterial strains encompass a very broad range. When other bacteria begin to die off (usually from high organic loads caused by the unknown death of an organism), Stability simply becomes more effective.
  • USE: Shake Seachem Stability well before use and turn off UV/ozone filter. Use 1 capful (5 mL) for each 40 L (10 US gallons) on the first day with a new aquarium. Then use 1 capful for each 80 L (20 US gallons) daily for 7 days. Fish and other aquatic species may be introduced at any time as long as the dosage is maintained for 7 days.
  • SAFE: The bacteria employed by Stability are non-sulfur fixing and will not produce toxic hydrogen sulfide. Stability is completely harmless to all aquatic organisms as well as aquatic plants, thus there is no danger of overuse.
  • Manufacture: Seachem Laboratories, Inc.
  • Item Weight: 10.2 ounces
  • Product Dimensions: 6.1 x 1.8 x 1.2 inches
  • Editor's Impressions Of The Seachem 116012607
  • Treatment Effectiveness
  • Quality
  • Value For Money
  • Affordability

Seachem 116012607 Final Thoughts

"A clean needle works too."

I intend to use this for every aquarium or pond I start. Boy, I thought I was having trouble with my filter. My water is crystal clear like the first day i filled it and i could be happier. I tried it without the water change and really didn't make a difference. The afternoon I received this product I added half a dose to each aquarium. If either or both ammonia and Nitrite are above 1ppm do not add ammonia. If you're treating injured fins or introducing new fish, this is for you.

Overall Score
4.7


(1018 Points)

7. Seachem Prime 1000ml

User Ratings: 91 1

Seachem 20 First Impressions

"No need to rinse."

My water is crystal clear again, and it smells like a healthy fish tank again. This water conditioner is a life saver! You need a source of ammonia to feed the bacteria which Dr. I wanted to see if it would take the chlorine out of my swimsuit. Do not clean the filters, do not change the filters. From their own colon or a hole in the ground. Fish are aerobic organisms that are susceptible to ROS.

  • Seachem Prime 1000ml
  • Dechlorinates
  • Detoxifies heavy metals
  • Promotes natural slime coat
  • Removes chlorine, chloramine
  • Manufacture: Seachem
  • Product Dimensions: 6.6 x 2.5 x 2.3 inches; 2.6 Pounds
  • Editor's Impressions Of The Seachem 20
  • Treatment Effectiveness
  • Quality
  • Value For Money
  • Affordability

Seachem 20 Final Thoughts

"Especially the Soothe."

I've using this for my betta for several years with every water change. This allows the conditioner time for its anti-heavy metal ingredients to work fully. It is much safer to simply to add 3 drops per gallon. I've had my fishy for 5 years now and I would say it's ALL because of Fluval. Just an idea incase someone doesn't have a spare dropper. Good Product, Good Price Gets five stars! You need to buy an eye dropper for this.

Overall Score
4.8


(474 Points)

8. Seachem Clarity 250ml

User Ratings: 72 7

Seachem 67101460 First Impressions

"This pristine is amazing!"

1st day, I put product in tank with Fluval Biological Cleaner for Aquariums also. I hope it makes the swimsuit last longer. One planted that has algae problem so bad. Way to go Fluval keep up the good WORK! You have to understand when to use this product, and what is is used for. I know you are going to worry about your fish DON'T they are fine. Fish are aerobic organisms that are susceptible to ROS.

  • Seachem Clarity 250ml
  • Fresh And Saltwater
  • Clears All Kinds Of Cloudiness
  • Plant and reef safe
  • Water clarifier for marine and freshwater
  • Clears all types of clouding
  • Reef and plant safe
  • Manufacture: Seachem Laboratories, Inc.
  • Product Dimensions: 6.1 x 2 x 1.2 inches; 5.29 Ounces
  • Editor's Impressions Of The Seachem 67101460
  • Treatment Effectiveness
  • Quality
  • Value For Money
  • Affordability

Seachem 67101460 Final Thoughts

"So easy to use."

I intend to use this for every aquarium or pond I start. I'm sold on this, I've tried SO MANY and wow. I use in a freshwater aquarium and works well. Easy to dispense the product without mess and easy to use per instructions. I have a 5 gallon tank, so that number was waaaay too high for me. I hope it makes the swimsuit last longer. I had a parasite problem, and had to heal my fishes scales and fins.

Overall Score
4.4


(389 Points)

9. Seachem Pond Prime Water Conditioner

User Ratings: 84 1

Seachem 116243308 First Impressions

"A clean needle works too."

The difference is that he was going twice his normal speed. The water we get here in SoCal is hard with chlorine in it. Way to go Fluval keep up the good WORK! Easy to dispense the product without mess and easy to use per instructions. The difference is that he was going twice his normal speed. UV light works on it but not much else. The reviews on people fish dying really spooked me.

  • Seachem Pond Prime Water Conditioner
  • CONDITIONER: Seachem Pond Prime is a complete conditioner that works to provide essential ions and stimulates natural slime coat in any pond.
  • REMOVER: Use 1/8 cup (2 tablespoons) of Seachem Pond Prime for each 600-700 US gallons to successfully remove chlorine or chloramine from your fish’s environment.
  • DETOXIFIER: Seachem Pond Prime will detoxify any ammonia or nitrite that live in your pond. To detoxify high concentrations of ammonia or nitrite, use 1/4 to 1/2 cup for each 600 gallons.
  • USE: If you are setting up a new pond, adding, or changing water, then Seachem Pond Prime should be the first choice conditioner to create and control a safe pond environment.
  • SAFETY: To detoxify nitrite in an emergency, up to 5 times the normal dose of Seachem Pond Prime may be used. If the water temperature is > 30 °C (86 °F) and chlorine or ammonia levels are low, use a half dose.
  • Complete and concentrated conditioner for decorative ponds
  • Removes chlorine, chloramine
  • Detoxifies ammonia, nitrite, and nitrate
  • Manufacture: Seachem Laboratories, Inc.
  • Product Dimensions: 7.6 x 2.4 x 1.5 inches; 1.1 Pounds
  • Editor's Impressions Of The Seachem 116243308
  • Treatment Effectiveness
  • Quality
  • Value For Money
  • Affordability

Seachem 116243308 Final Thoughts

"I was very surprised."

My water is crystal clear again, and it smells like a healthy fish tank again. He started making bubble nests again which ne never did when it was super cloudy. Easy to dispense the product without mess and easy to use per instructions. Use a heater and crank it to 82 degrees again without fish in the tank. It's an All Natural Product with out of this world results. I know you are going to want to add more chemicals, etc. Do not gravel vac or disturb the substrate.

Overall Score
4.8


(366 Points)

10. Seachem Laboratories INC METROPLEX (10 Grams)

User Ratings: 78 5

Seachem First Impressions

"Just measure and pour."

Now our fish have grown and we've added live plants. It took a couple of days to clear but it works. I'm sold on this, I've tried SO MANY and wow. I finally gave in and purchased this product. I tried it without the water change and really didn't make a difference. I even poured in extra to help with the healing. Way to go Fluval keep up the good WORK!

  • Seachem Laboratories INC METROPLEX (10 Grams)
  • 2 5-gram bottles MetroPlex water treatment
  • For use in both marine and freshwater aquariums
  • Gentle enough to not adversely affect the fish tank's filter bed
  • Use as part of a medicated food mix to safely treat fish without harming corals
  • MetroPlex is an effective treatment for protozoan and anaerobic bacterial diseases in fish
  • Manufacture: Seachem
  • Editor's Impressions Of The Seachem
  • Treatment Effectiveness
  • Quality
  • Value For Money
  • Affordability

Seachem Final Thoughts

"I recommend it."

This is my absolute favorite conditioner I have used for all my aquatic creatures. Sure enough they are back to their healthy coloration and didn't end up dying on me. I like API products and this is no different. Way to go Fluval keep up the good WORK! I finally gave in and purchased this product. Fish seem healthy and active during use. Initially this was used as a sample packet came with our aquarium.

Overall Score
4.5


(340 Points)

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