ok Help me make up my mind :)
Hi Steve, I'd go with the MH. It opens up your options way more. I don't think you'll have any trouble putting the bulb in the center of the tank, that is still a lot of light on a small tank. You probably won't get the same coralline growth as you would with lower light but you'll still get it.
I'd add a N.O. actinic to the fray as well. It will give you a nice dim dawn and dusk mode.
If you can set your bulb up in a way that would allow you to raise and lower it from the waters surface. As for the distance of the bulb from the water surface; anywhere from 3" to 12". It is up to you though a happy medium of around six is probably best.
Have fun.
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