I have a 75 gallon planted tank. Last week I rescued 2 keyhole cichlids from a pet shop where they were being bullied by another fish. The fish are eating fine swimming up and down fine. Yesterday I noticed a couple of white cotton patches on one of the keyhole. I quickly ran and got api fungal cure. I put it in yesterday and the water turned green but a few hrs later it was crystal clear. I have no active carbon running. Is this normal? Plush the patches haven't changed at all.
Thanks for any input.