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THe problem isn't with how deep the tank is. 150-175 watt will do nicely on a tank that is 20 inches deep, with SPS put high up you could grow some of that too. The light spred from only 1 MH bulb won't be enough to cover across 4 feet of water. Can you retro fit the MH to add on to the existing lights?
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
http://www.canreef.com/vbulletin/showthread.php?t=55041
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