Do not rely soley on the "watts/gal
" method. It is a bit more complicated then that. Consider it a very loose guideline instead of a rule. In general, Most softies and LPS
corals will do fine with 3-5watts/gal
or T5 lighting. I would shoot more for the 5 mark. If you have intensions of clams, SPS
corals or high light anemones, greater penetrating light such as MH
will be a better option. Bottom line...lighting is one of the most expensive parts of a reef tank. Decide what you want to keep and build your lighting sytem around the animals.