I'm not sure what the dimensions of that fixture are, but if the T5's will fit above your tank along with the LED's then I don't see why not. Another option would be to go the opposite route with all T5's and those blue LED strips. A T5 fixture like this could probably be picked up pretty cheap from a fellow hobbyists. I'm not sure where your located at, but you might want to see if there's a club in your area.
http://www.reefcentral.com/forums/forumdisplay.php?f=80