the calcium level can also be affected by what your salinty is....the higher your salinty the higher your calcium will be. if you use a 2 part buffer like b-ionic your calcium can shoot up. can you give your specifics?
i don't believe top offs will lower your calcium level.
i think i got a bad batch of salt.... anyways ill post my levels in a bit..
one more question..... i just bought a hang on the back skimmer.. question is does it take a while for the foam to start collecting in the upper tray????????