i came home today and found my second sally lightfoot crab dead and some of my clean up crew. also niticed my elegance shriveled. i tested my water parameters and here are my results: magnesium = 1300 dkh = 11 calcium = 560 !!!!!!!!!! phosphate = 0 nitrite = 0 nitrate = 0 ph = 8.3 i am assuming that my calcium is the culprit of killing some of my inverts and if i don't do something it may kill the rest of my inverts. i dosed last saturday night with bulk reef supply's 2 part system and followed the exact recommendation for dosing calcium. before i dosed my calcium was at 420 ppm and wanted to bring it up to 460ppm. brs recommends 450.3 ml of calcium which i dosed in a span of 2 hrs. tonight i tested and is is up to 560!!!!! what can i do to lower my calcium? water change? how much? this is a 90g tank with 35g sump. thank you.