My calcium is very high. Heard it wasnt bad but wanted your opinions. All my other water params are perfect. I hate to admit it but I cannot at the moment afford an RODI unit and have been using tap water. System is a 75g rr 2x250MH 10ks, 55g sump/refugium, ETSS 500 skimmer, mag 9.5 on skimmer and another on return. Have approx 50#s of well seasoned live rock, and 2 modded maxi 1200s for flow. Havent seen any problems from the high calcium yet except that green algae on glass seems to be growing faster. Thanks for the thoughts in advance.