Various protein skimmer assemblies (salt water people use these), put the output of the filter at the surface temporarily, paper towels
We all deal with it from time to time. It usually happens the day or two before a water change and I put the filter output at water level when the lights go out (not to vent CO2) and it reincorporates it into the water - the next day a w/c does away with it
once about 2 years ago on a asian aquarium site i had see a diy made from a cheapo micro internal filter upsidedown (inlet up outlet down :P )put inside a grided cut inlet pipe... and now for a while i see amano's vuppathing ...deja vu? Lol
Sent from the back of my wardroid, taping on a tin can bongo
I have the biofilm disappearing by itself if I don't feed the fish for a couple of days... Feed less and often than once in bulk.
sadly that does not always work. i have a tank that i feed once or twice a week and i still have have biofilm, the amount of food that i feed is minimal because the fish is rarely out for food. of my 5 tanks 3 have biofilm, really its only of 4 tanks because one has a surface skimmer.
the best "cure" to biofilm is surface agitation, or a surface skimmer.