Every once in a while I see a film-like substance on the surface of the water. Attached is a pic. Any idea what causes it and how to get rid of it? Thanks.
Do you feed frozen foods? Looks like an oil film, a skimmer or just some surface agitation should take care of it. In my FW tanks I've placed a piece of paper towel on the surface to pick up the stuff, but I'm not sure I'd want to put a paper towel in my salty tanks