I have found a Nova Extreme 4X24 fixture with lunar lights for 151.99 (free shipping ;-). I need more light than a 2 bulb fixture provides, but less than 4, as using all 4 would require CO2 (I have a 54 gallon tank). I would like to incorporate CO2 later, but because of the expense (and my budget) I would like to build my planted tank gradually. Buying a 4 light fixture would allow me the flexibiltiy of adding additional light and CO2 later. Also, since T5 bulbs run cooler (there is a cooling fan on this fixture), can the fixture be placed directly onto the glass top of my aquarium? My tank is in a family room and using the legs on the fixture (besides being a challenge because of the shape of the tank) would cast a glare into our eyes when sitting in the den (my tank stands >4 ft. tall).