Very low Calcium levels

[windcoast reefs]

Originally Posted by FragIt Dan

Are you adding the Kalk slowly? Adding it too fast can actually pull your Ca down rather than push it up. Also 240ppm Ca seems impossibly low, I would double check that result.
Dan

Double checked 3 times with elos, and twice with API test kits.

It is a very low dose of kalk. My ATO only adds 5 gallons of water a week and only has 2 tablespoons in the 5 gallons of water. It has never given me any issues before (started doing it 4 months ago), my levels have been pretty stable up until now.