| ulcer looking thing..help!! I have a 10 gallon aquarium with 4 red fin rosey tetras. All the water qualities are fine. I've had them for oh 6 months or so with no problems. They are eating, swimming normally. One fish has this ulcer, sore looking thing just in front of it's dorsal fin. It's about the size of a pin head, so it's easily noticed. Has a whiteish center, and a red ring around that. I thought it looked to big to be ick. I don't see anything else wrong with any of the fish. What is it and what should I do |