I am looking at getting a 150 watt metal halide light that normally comes for the 20x20x20 cube from current usa. I will be placing it over a 54 gallon corner tank that is 23" tall. What do you all think regarding whether this is enough...I would like to keep some sps, clams, and other corals. One of the issues I have with this light is that it only comes with the one bulb (no actinics). Maybe there is something out there to supplement this light that you can hang off of the edge of the tank. This is the link that shows the light...

http://www.current-usa.com/solana.html