Lohoyan
Aquarium Advice Regular
I had this oily looking film on top of my 45G previously. I didn't go away with water changes. Finally I took sheets of paper towel and dropped then down flat on the surface and scooped them away, doing this repeatedly till most of it was gone. Now it seems to be coming back? Its a fairly new tank. I try to be careful, if I have to put my arm in I make sure I haven't handled anything even remotely smelly or noxious for several hours. I did reseal the tank with black silicone 2, could it be leaching coloring into the water? It looks nasty but doesn't seem to bother the fish.