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yeah it mats well on rocks flow helps for stuff on the sandbed but also increases the amount of "clean water" the cyano gets , not necessarily blows it away. cyano is a problem that will come and go over the years it happens to pretty much all tanks even in low nutrient systems. chemicals do work but i think youll find it does come back if the underlying issues are not getting attention. the over feeding must have cause a spike in nutrients and as the ol saying goes " the solution to pollution is dilution" so lots of water changes increased flow(or in your case maintain flow lol) and good husbandry will eventually knock it down will just take a coule weeks or so. goodluck buddy and cheers ![]() ![]()
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