That used to happen to me too. If you don't have an overflow then a protein sheen can build up. I bought a surface skimmer attachment for my HOB skimmer and that worked. But I also found that if I emptyed my skimmer cup and cleaned it before it overflowed then I didn't notice it as much
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35g Algae tank....some nuisance corals
-- Deltec MCE600 Skimmer
-- 4x36" GLO T5HO
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