Welcome to AA!
Assuming you are talking about 2 250w MH
bulbs, no, it's not overkill for SPS
. You will have a hard time keeping any soft corals tho and zoa's will need to be at the bottom. The xenia probably won't care where it is..grows like a weed anyway. LPS
would be fine in the lower half of the tank. Lighting shouldn't be an issue, but it's geared more for SPS
and that also means alot of flow. LPS
don't like alot of flow or a real lot of light.
(Your tank is WAY too small for those 2 tangs)