calcium

do you have a calcium reactor? if you do not, try to use the seachem Ca and Alk buffer to dose it per instruction. Good luck
 
Agreed. Doesn't sound like you have a calcium reactor if your asking this question. Soooo.... there is many additives you can choose from. There is liquid calcium like this http://www.marinedepot.com/md_viewItem.asp?idproduct=KM3233
there is power calcium like this http://www.marinedepot.com/md_viewItem.asp?idproduct=KM3371 and there is all different brands that make them.
Integra mentioned a 2 part additive. Because Calcium and alk are to very important parts to healthy tank and they go hand and hand (along with ph) you need to check both the levels and adjust equally. A lot of people use a 2 part additive to keep both levels in check.
What are your alk levels?
 
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