Help! My baby has a hole in his dorsal fin. Right in the middle. It is not ragged and he does not look or act ill. Smooth edges. There's an ADF in the tank with him. She looks fine. I put some Melafix in the tank last night. The parameters are normal. He's in a 10 g that gets a weekly 50%water change. PLastic plants. He loves to swim all through them and lay on them, so I hope he just poked it or something, but its never happened before. He's getting a live plant overhaul soon. Thoughts? I don't want it to get worse. Thanks!