I have been thinking about this for a few days now and i cant seem to come to a difinitive answer. I have some bio film growing on the top of my water and i want it gone. it looks terrible and dont smell nice either. i have been trying to figure out how to rig up a surface skimmer to a canister filter. i know that they sell some but not for fx5s. is there another way to get rid of this junk? maybe a powerhead to stir the surface up a bit more?