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i had that stuff pretty bad and i actually found mechanical removal to work pretty well. it is near impossible to grap pieces without having little fragments float away, but if you pull it out or use a toothbrush with a siphon nearby you can get almost all of it.
that's a lot of siphoning of course, so run the hose into a sock so that you can recover the water.
my params were also bad to begin with. i think that i probably had high PO4 and i know that i wasn't maintaining hardness or pH very well.
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