one of my platys has a white spot on its head and it looks like there are no scales there and it looks a little indented like her skin is rottening away or something. its not a nice thing to look at. doesnt seem to be affecting her yet though. also do some fish become hungry once the lights go out or something cuz i will turn the light off for the night and the next morning one of my fishs tails will be bitten up. maybe corydoras get carnivorous at night lol. any feedback?