Obviously, of course not, but that's exactly what it looks like. Last night, all was well with Benny. He was swimming happily and eating well. This morning, when I checked on them, Tom (the danio collective), Emery (the pleco) and the two unnamed gouramis were just fine. In fact, I found it odd that the gouramis were out swimming around in the open. Then I found Benny, curled up at the bottom of the tank, with a white fuzz all over his transparent fins. It's spreading down his belly, and the scales underneath it are discolored (a gross pink instead of their usual bright blue). Last night, his color was 100 times better than it had been when I got him. His fins had a nice, bright hue. Today, his colors are dull and fading. He's also got shiny (not a good shiny, from the looks of it) little dots along his tail. If it helps, I did notice him acting a little "odd" for the last day but, I guess as a n00b, thought he was just amusing himself. He'd swim under the filter stream and shimmy his tail and swam around the heater (imagine the stripes on a barber's pole-that's how he was swimming). It was out of the ordinary, but he does a lot of crazy things (like squeezing through the little openings for the castle) so I assumed he was just having fun. Anyway, I think I missed him "itching" last night. My readings are still the same. Ammonia/nitrites are reading between the "safe" and "stress" color strips and the nitrates are reading "stress." I've been doing 20% water changes two to three times a week, but I just can't get them down. I add a pinch of aquarium salt every other change, as I've been told that's beneficial to fish with scales. I put Benny in the little cup he came in, so he's been separated from the others. He's hanging out at the bottom of the cup and not looking too great. So, my questions. 1) What, if anything, can I do to get him better? 2) Will the Tom/Emery/gourami twins suffer the same fate? 3) If so, what do I do for them? 4) If I need to do a 100% change, how do I do it this right? My house is kept at a consistent 62 degrees, much lower than the 78 degrees of the tank. The big tropical fish store (it's pretty far away, but the only one I know of that carries any real medication/supplies) doesn't open for a while, so I need to wait. If you guys could give me some specific product names, it would help a ton!