Dry Water Film Surface
I just got back from being gone for nearly 2 days, I come home and turn on the lights, find that the surface of my tank has a layer of dry water muggy stuff. I stirred it and they all broke apart into little white pieces. Is this harmful? What can I do to prevent this from happening again? I raised my spray bar just a bit so that the surface is getting some current, but no idea if that will help.