Djm

I have had my 220 up and cycled for about 2.5 months now... I have 200 lbs of live rock and a 125 gallon sump system. Using a dual over flow running one side to the fuge 3"(sand bed) the other to an INS 450 reef dynamics skimmer. Middle return overflow. (I prefer middle for return...) calcium reactor, as well as a sulfur reactor... My tank specs were perfect up until last week. My calcium levels went from 450 to 550 ... My question is that i have only a couple nasarius snails and 3 ...