The tank is not even one year old and you've stocked it with many coral and inverts that will progressively utilize more calcium carbonate as they grow. I'd say that this increase is absolutely normal. When my former 120gal display was full of large colonies it would drop over 1 DKH per day if the calcium reactor was not running. Soon you may want to graduate to an automated DIY 2 part dosing system or calcium reactor yourself. Buying premixed additives and constantly measuring them out sounds expensive and tedious.
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