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Surface Film

I have a 125gal planted tank established for over 6 years. I have a surface 
film that looks like a thin layer of wax paper floating. When I do a water 
change and do pruning It disappears. Then the film starts back within 10 
hours and builds. It does not seem to affect the fish. If I try to scoop it 
up with a fine mesh net, some is collected and the rest breaks up in the 
turbulence, looking like skin peelings. It has no odor and washes out of the 
net easily. I use a CO2, yeast system, but have turned it off for over a week 
Any suggestions?