I noticed that my one betta tank has two very small chunks floating on the surface that match his blue color. I looked closely at him and can't see any missing scales. He seems healthy, eats regularly, etc... There is also a little bit of filmy substance on the surface, though that's clear in color. But I'm concerned about what's floating, if I should worry, etc. I do regular water changes and have never had any negative water tests that suggest ammonia or anything. Any advice is appreciated?