Calcium High / Need Advise

[gwayneo]

Can anyone tell me how to lower my calcium . I had high calcium in my old tank . I changed tanks last weekend from a 115 gal to a 150 gal. added about 50 gals of new RO water. ,but still high. I have changed salt but still Water temp is 78 steady getting a calcium reading of 520 - 540 . My alk - 8.624 , Ph 8.2 , Mag 1350 , Phos 0 , Nitrates 0 . I have even tryed two different test kits ??????
Can someone give any advise. Thanks