Alright so I got a Green Terror about 3 weeks ago. I found him at my LFS he was a bit beat up, his fins were torn up and didn't look to great he had tears etc... all over them. I figured I could get his fins back to normal fairly easy which pretty much was what was happening until a couple days ago when I noticed that he started to get some white cotton looking stuff on the tip of his dorsal fin and another spot like that on his Pectoral Fin. I just want to make sure that this is not some sort of parasite or anything like that, that can harm my fish or my other fish in the tank. If anyone can give me a definite answer of what it is and how I can get rid of it would very helpful.