Ever thought to give hydrogen peroxide a try? I've used it for a few different applications and it works great. Typically you dose 1ml/10 gal for anywhere from 7-14 days, you should see it start to clear up in a few days of use and your glass will stay cleaner and your skimmer will skim heavier. H2O2 doesn't affect any corals, fish, inverts etc, however your Zoa's will close upon dosing but then open up after some adjustment time.
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