It's not often that I have to add mag. but I like to try and keep mine about 1350-1400 and sometimes I do have to add a little. I run ARM media in my calcium reactor as well and do bi-weekly water changes but not 25% probably more like 20% if you take the rock into consideration. I just have read a few posts lately on another web site and it seems that a lot of people are also putting - I guess it's dolomite - in their calcium reactor and wondered if it might help with the overall balance.
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