I was sitting and looking at my fish last night and noticed a small yellowish patch on the back of one of my kuhli loaches near the tail. It's maybe 1 or 2 mm in diameter. Doesn't look like ich. Could one of the other fish in the tank have bitten him (her)? Any ideas? Should I leave him in the main tank..or quarentine him? ANd I already have some new fish in my q-tank.
