I would say that 2 250W MH
bulbs with 2 110W actinic VHO
bulbs would look nice on your 90 gal
I would recommend 2 MH
's because your tank is 4' in total lenght. Each MH
lamp is good to lamp approx 2 square feet of tank space.
I would also suggest you rethink the anenome at this point. THere really is not that good of a track record with them in new tanks. Is your tank new?
If you dont got anenome then you could do 4 96W power compacts or 4 110W VHO
just fine for most corals that dont demand high light.