I used this on my 36 gallons. Aquarium with freshwater rainbow fish in the bow, my grandson's 20 gallon. Molly, Swordtail in the freshwater aquarium and at work on a 7.5 gallon desktop. Tetra aquarium with low pH, soft water. My personal advice to a new user: when you put it on, turn off all your filters, attachments, etc. for 15-20 minutes and let them slowly sink to the substrate. Air bubbles may remain. Then, after this time, turn the filters back on. This has worked best for me, no dissolution problems, no dead fish, no nitrates. If you don't do this, the fish will swim around until it decides to eat it or not, so I prefer not to get confused and let it sink. I think this is a sure useful product and I have only had positive results. My 36 gallons. I use an onion to jump from 15ppm to 80ppm per week due to rotting wood I'm sure plus feed etc. I don't use live plants, personal choice depends on age. Started with that, the results are now creep controllable. I used Nitra-Zorb which worked great but needs to be refreshed with hot salt water for two hours and then infused again. Lots of trouble and then one day a bag came apart at the seam and the product came in with my fish while I was working. I lost 3 rainbows. Maybe good, but I will never use it again. This product is easy to use, easy to store, fish safe and I love it. Now I will say they could have done better with the instructions for long term use but the cap clearly labeled 5ml or 10ml is the perfect complement to ease of use.
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