First time posting on reef 2 reef. Been asking for advice from a Facebook good but haven’t had any luck. I have a 75 gallon display with a 18gallon sump. I have a fuge going, but to me the rites and phosphate are still to high. I had .17 on the phosphate and 17.6 on rites. Done a 20% water change and still have .15 phosphate and 18.4 rites. Do I not have a bright enough light for the fuge or not enough chato. I am using rodi water for salt mix and ato