If u want all kinds of reef stuff u could do a vho retro kit or if u want real good lighting go metal halide both should probubly be either
10k or 12k alot of guys are startin to run the Iwasaki 6.5k metal halide i hear they are good to
here is a link to show u diff light heathttp://www.***********.com/a_lt_mh_bulb_info.asp?CartId=