Hey Reefers, I have a 220 gallon mixed reef about four years old. Corals are doing good, but SPS could you some better color. I think the high nitrates are contributing to that. I have tested with Salifert and Red Sea Pro Nitate test kits and both are reading about 50-60 PM. I have a a refugium with Chaeto that has lowered them some, but they seem to stay in that 50 ppm range. So which method would you look to from the poll above, thanks. Brian