Sooo not really a disease, but I just did something stupid. Sooo until recently I never got the memo to pre-dissolve flourish comprehensive in maybe a quart of water and then put it in. I came up with that genius idea a couple weeks ago and its still not a habit -- I swear my brain doesn't work half the time too. Anyways... I used to just try to pour it away from the fish, ideally by the filter so it evenly disperses it quickly. This time, to make things worse I thought I had a 1/2 tsp measuring spoon but it was a whole tsp. So I initially poured in half, which was double what I thought. I swear normally it dissolves and disperses quickly, but this time it was like a thick cloud of it and of course my favorite angelfish (the most beautiful blue color for a juvenile) swims right through it. D: He seems fine about 20 minutes later when I'm writing this, but I just hope he doesn't die from it or end up with health problems/infertility or something. I'm super paranoid, maybe I'm over-reacting. I just needed to get this out kind of. -.- I feel kinda sick thinking I may have harmed my lovely fishies.