you can make your own Canopy and add this retro to it.
http://www.aquabuys.com/miva/merchant.mvc?Screen=PROD&Product_Code=sunpaq_1x40_20&Category_Code=d3&Product_Count=4">http://www.aquabuys.com/miva/merchant.mvc?Screen=PROD&Product_Code=sunpaq_1x40_20&Category_Code=d3&Product_Count=4</a>
[IMG]http://www.aquabuys.com/miva/merchant.mvc?Screen=PROD&Product_Code=sunpaq_2x40_20&Category_Code=d3&Product_Count=9">http://www.aquabuys.com/miva/merchant.mvc?Screen=PROD&Product_Code=sunpaq_2x40_20&Category_Code=d3&Product_Count=9</a>
I highly reccomend Aquabuys. Its local and has good prices on equipment. This retro will give you plenty of light for corals. The first retro will give you 4 watts per gallon second will give you 8. And from what I understand that about where you want to be for corals. you might find some used ballast or retros on this forum. I just started so I might be wrong but I'm sure other's will chime in.
Billy