Ming it sounds like Red slime/cynobacteria. Also check your nitrate and phosphate levels. I recently had a huge problem with this becuase of a high bioload in my FOWLR tank. Upgraded to a more powerful skimmer and has completely disappeared.
Scott
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Bryan
"You can swim all day in the Sea of Knowledge and still come out completely dry."-Norman Juster
Current Tank Info: 300gl FOWLR/155glRT
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