How far up is your bommie going to go up? If the ritteri is going to be near the top half of the tank, I don't see a problem with a 250w MH... SE or DE. I hear really good things about those lumenarc pendents, I'm pretty sure one of those will be more than enough for a 30" square area. Since you said yourself that this is a tank for your ritteri, light doesn't really need to penetrate that far down.
-Rich
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