My betta has something black on his flipper. At first I thought was just something stuck on it, but it has been there for a while now. Its not a spot. Looks like a build up of something. He swims well. No problems noticed so far other than that thing is maybe getting bigger..? I tried really hard to get a picture but I could not get one that showed his flipper that well. Any ideas as to what this thing is? Is it harmful?
did some more research (I am talking about the pectoral fin) didn't know the correct term. Anyway, I found one other post on another forum from someone with the same thing. Other people replied thinking it was just the fin repairing itself. May be an injury or something, but nothing serious. The pictures were similar, only the black on that person's betta was bigger.
I hope all is well. If anyone has any ideas please help me out. I am still worried.