i just got a ro/di 4 stage unit about a month ago,100 gallon tank 400 watt of light, skimmer,70 80 pounds of live rock,30 gallon sump some bio balls still using maybe 1/4 ..ifeed 3 time a week ,i drip kak.. also use part a and b ....i have 5 fish...and 9 corals the fish and corals are fine the...