Black spots on decor?
Black spots on decor?
i was wondering what these little black spots are. they are on all the decorations in my tank. they have been there for a while and haven't seemed to get any worse than what they are. i took everything out last night and washed them under hot water and scrubs with a brush but it wasn't coming off easily so some of it is still on there. i didn't want to use soap because i didn't want to wash away bacteria or have to worry about soap getting in the tank. i didn't know if it's just some kind of algae or what, just seems to be a bunch of little black spots.