Sure it removed phosphates in my system but it did irritate the hell out of my LPS corals.
If you run it in a reactor make sure the flow is slow enough that it doesn't tumble *at all*. If it tumbles you'll get it breaking up and getting into your water column. GFO is safer to use, Rowaphos being the "premium" brand of GFO.
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I have to go out and buy more snails for my hermit crabs.
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