It's waxes, oils, proteins AKA scum  Pointing the powerhead toward the surface is exactly what the doctor ordered. You can have dead spots on the surface of the water too and cause oil slicks. Rearranging the powerheads or just forcing one up to make a chop, breaks up the slick so can be taken in through the overflow box, skimmer etc.
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Experience in aquaria, 35 years. Experience in marine, 20+ years. Experience in Reef Keeping, 6 years. Always a newbie! |