 Re: Losing Coraline....
Do you check alkalinity? That is an important one as well. Magnesium is related to the whole, Cal, Alk, pH equation.
Also, what is your specific gravity? 
Sorry for all the questions. Your calcium is a little low but not bad...I have had mine there and gotten good coralline growth. I am trying to keep my Calcium around 400-425.
Your pH is a bit on the high end , but not unreasonably so. I am going to guess that your alkalinity may be low? Maybe Magnesium as well. _________  I Love My Sig By John Hawkins!!!!!!!!!!!!!
Date Started 9/04 58 gallon Oceanic Tank, 20 gal DIY sump/fuge w/ Kent Marine Auto top-off, Air Water Ice RO/DI, 10,000 K 175 W MH, 2 VHO 03's 96W each, AquaC EV 120 Skimmer
80 lbs LR, DSB in FUGE, 1 - 2 " LS in tank
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