I just bought 2 more neon tetras (if anyone remembers me I had 4 and people here recommended I get 2 more), so I bought 2 more. One of them, though looks like it has a little white bump thats tiny under its mouth. What should i do? Return it? Or take it out at least and keep it in another tank until I can return it? I don't want all my other fish catching it. He's been in there about 20 min now. Will my fish be ok?