fish therapist
New Member
My yr old 30 gallon reef tank can't seem to keep the calcium up.I test weekly and all top off water has liquid calc. in it.Anyone have experiance with the instant ocean salt mix being low on calcium cause I had used coralife before and calcium levels where high then.With all the caclium supplements I've only managed to get it to about 250-300 ppm range! But My hard corals are still thriving and growing like crazy.I'm also starting to think it's my test kit which is a Red Sea mini -lab.And I also do frequent small water changes.Anyone have exp. with these test kits or salts causing this please share.But hopefully any day no my sump will be built and I'll be able to drip kalk in which is bound to work.And the current liquid calcium mix is by red sea also since the kent product before didn't seem to be working.