not a dirted tank, substrate is seachem fluorite. Also, I know a skimmer would remove the film, but its a 4 gallon tank and honestly, there's not room for a skimmer in the tank as is.
Was wondering more what are the root causes of the film? It's a shrimp tank so I don't feed the shrimp that often honestly. They mostly feed off the biofilm, maybe I toss them some shrimp pellets once or twice a week. I am battling some algae in the tank, so maybe that's the source of the film?
Instead of angling the spraybar up from below the water's surface (which does agitate the surface causes a good ripple, but doesn't really seem to break the surface), if I angled it down from above, would that be more effective in breaking the film up?