Very low Calcium levels

[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

[reefwars]

Originally Posted by FragIt Dan

Also 240ppm Ca seems impossibly low, I would double check that result.
Dan

absolutely

[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.

[reefwars]

you have corals?

[windcoast reefs]

Originally Posted by reefwars

you have corals?

Yup, probably 60+ frags and 8 colonies of SPS and 5 colonies of LPS in the tank. Plus a bunch of oddball corals.

[asylumdown]

Are you getting any precipitation of any kind on your pumps? I had a problem on my last tank that involved me constantly testing really low levels of calcium, which in turn led me to up the rate I was dosing. THe problem was actually that I was dosing in the wrong ratios, putting in too much alk. It was driving a precipitation reaction. I only figured out what was going on when my pumps all failed in the same week.

[windcoast reefs]

Originally Posted by asylumdown

Are you getting any precipitation of any kind on your pumps? I had a problem on my last tank that involved me constantly testing really low levels of calcium, which in turn led me to up the rate I was dosing. THe problem was actually that I was dosing in the wrong ratios, putting in too much alk. It was driving a precipitation reaction. I only figured out what was going on when my pumps all failed in the same week.

Can't see any kind of precipitation but ill pull some pumps out and double check.