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This is the 2nd post advising running carbon. Is this a usual filter in tanks? I haven't ran carbon in my tank since set up, now wondering if I should.
As for question #3, there is a possibilty that alkalinity maybe decreased. Before running phosban test your Alk levels and just monitor it. I think if there is alot of Phos that has to be filtered out, that causes a drop in Alk.
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