I would go with a bigger overflows holes for the bulkheads, I Have had a 1" on my 280 anf it gurgled, so i think you would be better with 2" holes of 1.75" just so that you can carry the flow better.
HTH
Mike
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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