I have 2 O Clown in QT. They have been there since 6/29, so, almost 4 weeks. They were bought from the LFS, tank/captive bred, in a tank with only the same species. They ate well at the LFS(I watched) and they have been very active and eating well in QT. The Larger of the 2 will eat from the tip of my finger if I put food on it and stick it in the tank(clean hands of course). Anyway, yesterday when I got home I noticed a white spot on the back top fin of the larger clown. It's not small enough to be Ich, at least based on the pics I've seen. I can't get a pic b/c the clown is too fast. But, the activeness and eating habits haven't changed. What could it be, and what should I do?