i have a 240 of the same dimensions and this is the flow on my system - it seems to be doing well...
4 @ seio 2600 on two controllers
1 @ tunze powerhead (1200gph) on single controller
about 2000gph in return flow.
im estimating (since the flow is probably overestimated a bit) about 50X turnover per hour.
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Ace
tank build thread linked to the little red house.
new tank here: http://www.reefcentral.com/forums/showthread.php?s=&threadid=1276784
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