Willow! I'm sad for you!!! I'd hate to tell you to take everything out and start over. . . that's generally a last-ditch resort. . .
Have you any
idea where this film is coming from?
In my tanks, the only thing I've seen to resemble this was either uneaten food molding over, or caused by the driftwood - could it be either of these?
Were it my tank, I would take the wood out for a bit, just to eliminate possibilities, feed very sparingly, and up your water-changes - being sure to siphon the substrate with each change. . .
Filter sounds like running water. . .assuming this is a canister filter? Is the spraybar under the water, and spraying into the tank properly? Could be it needs a taking apart and a rinsing in old tank water if you feel the filter is clogged/dirty, but don't replace any media unless it's falling apart. I'd hate to see you knock your tank into a mini-cycle from over-ferkling. . . *worries*
I want Pear(L) gourami tooooooo! Holding off for the big tank(stiiilllll) Went to find you in chat, buuuuut, you weren't there T____T