My tank is fairly new(2 months old) but I keep all my parameters in line carefully: pH=8.3,Ammonia,Nitrates,nitrates =0, dKh=8.5, Ca= 470mg/L,temp=82F,doing water changes every other week,while topping off with Ro/DI water.
It's a 55 gal with aqua C 180,80Lbs LR and 80 of "live"sand bed...