Lighting for an oceanic tank

[tprize]

I am trying to figure out of a 70W or a 150W MH would be good enough for the oceanic 30G cube Dimensions 20x21x19 I would like to minimize the amount of light I need for cost reasons. I am only planning on keeping basic SPS towards the top and LPS and zoas toward the bottom. Thanks!

[Toddrtrex]

I have a 250 watt sunpod over mine. I think that the 70 watt would be too dim, and would go with 150.

I have a handful of SPS in mine (( mainly because I just re-did it, and will have more in there in the future )), a decent amount of zoas and 2 Haddoni carpet anemones (( only one is going to stay in there ))