my red hook silver dollor as a round bump on his nose. it looks like a pimple i don't want to treat the tank as i just moved in a new royal pleco and don't want to med if i don't have too. i was wondering if it could be from him running into something as he likes to chase around the other hooks. also he doesn't have anymore of these bumps as of right now. the other fish in the tank look good and are acting the same as always. does anyone know what i should do or what this little pimple is 