I agree that keeping the 250s would be better than switching to 2 x 400. The difference is probably not enough to warrant upgrading to 400 3 times.
FWIW, I was going to use 250s, but a screw up on my bulb order a couple of years ago put me into 400s (again). Now with a deeper tank, I'm sure they'll work better, especially running radiums.
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Brad
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