bio film on top of the tank
I just reset up an old 10g tank i had sitting around with a mix of flourite and regular gravel. I tried washing the gravel mix but apparently did not do a great job. There is a film on top of the water now which blocks alot of the light. What can i do about it? (trying to syphon water out isnt really working since the film is on top). Where does it come from? Any info is appreciated.