Your tank looks well established so I'm not surprised. But to be certain, try another test kit to make sure that you are getting accurate results because overdosing can be disastrous. If that proves that you're simply consuming a lot of calcium carbonate then I guess you're consuming a lot of calcium carbonate and you'll need to supplement more.
When my colonies were larger and my system volume was smaller I could easily drop over 1 DKH daily if my Ca Reactor wasn't running.
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