Make sure your kit is good. I would get a second opinion via a good salifert test kit. As for raising your Ca
, if indeed it shows low, check your mg
levels. depressed mg
levels (Should be around 1350ppm) can cause your ca
to flatline. Your alk
looks a tad high, so long as its steady there. Getting ca
up will be more challanging at 11dkh, but should raise with some ca
additive like Kents turbo calcium or the like. A and B additives are typically for maint not really intended to raise one specific param.