
I was very excited when I tried this product for the first time. For the first few days the tank looked SO much better with less algae (shockingly better). The problem is that after I did the 2nd dose exactly as directed on the bottle all the fish stopped moving. It looked like they were suspended in jelly. They were alive but not swimming at all. Everyone just sat still. So I removed 90% of the water and suddenly the fish started swimming. The algae came back after a few days so I bought two bristle catfish and now the problem seems to be solved. I'm sorry I put my beautiful fish through this chemical test. I'm usually very happy with API products, but not with this one.

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