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So for a few weeks I have had green floating flakes swirling around my 90G tank. They look like algea flakes. They are very thin, different shapes and sizes. I do 20+ gallon water changes every two weeks, I vacuum my substrate every two weeks and change the sump socks several times a month. I feed seaweed every morning for my Fox Face and Hippo Tang and Larry's Reef Frenzy. Is it my return pump tubes that need a scrub from the build up of gunk on the pipe walls? Am I not turning over enough gph (btw I have not calculated that before). I have a Koralia Evolution 1040 and my return pump moving the water. It doesn't look bad from a far but when you get up to the tank the flakes are everywhere. Help. :confused2::confused2::confused2::confused2::confused2: