I do a bit of fragging.
175watt? thats a strange rating. I take it you are in the USA? here they go up in 150, 250, 400,1000.
I have about 12 acros, 1 hydnophora, 1 porites. and a few lps such as dohmnuts etc. mines a single 150 watt light. how do you keep your calcium up? I'v had to build a calcium reactor for mine because it kept crashing.