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Could be flow in that it's not getting it up to be skimmed out, but the reality is, you have higher than ideal nutrient levels that are causing the cyano to grow.
I have never used chemi-clean, but I believe Marc (melev) has so you could ask him about it.
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Jonathan--DIBS Breeder and Card carrying member of the Square Skimmer Brigade
(Click on the Red House to see my pics garage)
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