The last few months it's been 5gal (10%) every 2-3 weeks. Before that was the same every month or so. First couple years using IO, but switched to DD H2Ocean after a bad bucket of IO wiped out nearly all livestock in the tank. (didn't fiure out the cause of that one till it was too late)
Last edited by jostafew; 03-12-2015 at 05:40 AM.
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