I didn't totally know where to put this so if this is the wrong spot feel free to move it. Last night I was looking at my angelfish and I noticed that his left ventral fin is gone. I only got him last week so I'm not sure if he had it when I got him (I can't remember at all). What can I do about this? And if he had it when I got him, what could have happened to it? I have 2 Serpae Tetras and 6 Black Skirt Tetras and occasionaly I see them nip at him, but could they have ripped it completely off? Any help or suggestions would be wonderful!