Just following along...
Someone earlier asked about doing water changes when running an ATS. I don't do them in my 240g mixed reef. I do however add ALK, CAL, Mag, Lugol's, SeaChem Reef+ and top-off with Kalk. I've been doing this now for about 4 months and have had good success. I also use Phosban when my PO4 levels start to creep up.