When I first got my fish tank, my boyfriend's buddy thought it would be funny to dump some left over fishing minnows in my tank, i didnt think it would hurt anything but my other fish started getting diseases and fin rot. Honostly, the bottom right fish looks EXACTLY like the fishing minnows that I had. Just in case this is what you fish is, i would be observant because all my fish got better and are in great health since i got rid of the fishing minnows, so im sure that they are not healthy to keep in a tank. I attatched a picture of minnows that look relatively close to the ones that I had (mine were more silvery). I hope that I have helped. If you need to ask me anything my e-mail is travsgurl__69@hotmail.com. (2 under_scores)
~Kim