Phos will feed algae and also inhibit coral growth. Mag is used as a counter ion for balancing Ca and CO3 concentrations. Keeps more Ca and CO3 in solution.
david
Nitrates are at the end of the biological decay pathway, first things die then they start to decay. The process does take some time and is not instant, other wise we could all cycle our tanks in a day.
Buy a well known skimmer such as ASM, Euroreef or get our very own GSA. Usually cut the rating by half on most skimmers as that rating is for a fish only tank and not a reef tank. Name the skimmer you are thinking about purchasing and members will chime in on what they think. I empty my skimmer cup every three days = 200mls of skimmate.
David
I had a similar problem. I cut the intake pipe to lower the intake and it solved my problem. however, a picture might give a better idea of other causes.
david
I sent in a ocean runner pump for repair a day before New Years and the pump was repaired and overnighted the day after it was received. I really appreciate Aqua Medic's prompt customer service. Just thought of sharing my A-M experience