greenish film on inside of glass?

scrapman

Member
I have a pesty greenish film growing on the inside glass of my 90 gal. When I use the magnets it disappears in a cloud but reappears a couple days later.
What could it be? It's not hairy algae, just a thin film of very small particulates.
My parameters are great. My lighting is reduced as well as the feeding.
Excellent filtration and oversize Octo skimmer sitting in a 20 gal tank below main tank.
Help please.

Thanks
 
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