Quote:
My Ca levels in the tank run from 440 to 500
My dkh levels in the tank run from 9.8 to 14.7
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To me, that seems like a HUGE swing in the course of 1 day. Far from what I would consider stable parameters. I find it hard to believe your tanks inhabitants are actually consuming that much. Do you see any precipitation on your pumps, heaters, sump walls?
Sorry I can't give you any advise on your setup. I go the KISS route and use DIY 2-part supplements.