The one on the bottom left, last pic is a harlequin rasbora. (Or possibly an espei? I have trouble telling them apart). I hear they're really great fish. They like soft water, and I have water that is 7.6 PH and I don't know how they'd fare with that, otherwise I'd have a school of them. You'd don't have just one, do you? They are not happy unless in schools.