Are the filter and biowheel connected to the hood? If this is the case and you don't want to remove them then if the hood is big enough, look into retrofit kits. It really depends on the corals you want to keep as to what lights you'll need to get.
If it is a small hood then buy a fixture to go in front of it. I would probably need to see a pic of your tank to be able to tell for certain.
Do you not have a sump or a wet/dry on it?
_________
55gal,260 watt PC(2x65 actinic,2x65 10k daylight,8 lunar LED) 45#LR, 45#LS, 3 maxi-jet 900's on a natural wavemaker timer,phosban reactor, 5 gal fuge (built out of standard 10 gallon tank) with chaeto, grape, and feather caulerpa, sealife systems protein skimmer, wet/dry, 4 blue/green chromi, 1 skunk cleaner shrimp, 1 coral beauty,1 true perc, 5 mexican turbo snails, assorted dwarf blue leg hermits, astrea snails, and nerite snails |