I have a 72 gallon setup with 65 pounds of live rock, a red sea skimmer, and a 20 gallon sump refugium with 5 - 7 pounds of miracle mud. Ammonia, Nitrite, Nitrate are zero, pH 8.3, calcium is good. All fish (Hipo tang, yellow tang, flame angel, gobies, clowns, damsels) and limited inverts...