I've got a 24" 48W Hagen Glo over my 20gal soft coral nano. Its certainly brighter to the naked eye than the 65W Coralife PC fixture that I used to use but I would definitely go used metal halide in your case if those are your options. I dont know if its already sold but this would be a pretty nice package
http://canreef.com/vbulletin/showthr...light=lumenmax