My local Petco was having one of those "dollar per gallon" sales a few weeks back, so I decided to get a forty gallon. I cycled it and just got 3 oranda goldfish. One of them had some weird white fiber-y looking gunk on his body (you can't really see it on him unless you look close) that was peeling off of him at random. Is it an early sign of columnaris or something? I'm scared, I worked quite a bit on this tank.