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In my previous tank I had halmidia growing like crazy and since I have the same rock in my new tank I added the phosban reactor and the halmidia is in check and does not grow out of controle.
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I could be wrong but isn't Halmidia the macro that uses calcium to grow? Would PO4 even effect it's growth rate? Or does it use both Ca and NO3.
Do you guys use RODi water?