Hey Trevor, you still don't have lights?
If you really want halide (over t5) my suggestions are, if you use one bulb is to go with a 400W mogul as you get better spread with a mogul and the 400W will allow you to hang higher for better spread too. If you go with two bulbs I would pick 250W mogul bulbs because you can mount the 250W lower to get the best PAR to the corals, but still get the spread for the 24" width. The LumenMax are about as good a reflector as you can get as far as spread goes, so that's a really good option for the single bulb setup.
As far as bulb choices go, I would go with a Radium for the 400W and Phoenix for 250W. You can tweak the color produced by careful choice of ballast. The Radium bulb is actually a 360W bulb, so you can pick a ballast that puts out this amount like a Blueline "400W" electronic and you will get a bluer look. If you like whiter, you can overdrive it with an HQI ballast that will power it around 440W. The PAR will be relative to the watts put into it, but with only 20" depth I don't think you will need to worry much. For the Phoenix the same applies, use a 250W electronic for a bluer look (almost like Windex lol) and a 250W HQI if you like a whiter look.
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~ Mindy
SPS fanatic.
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