Actually Nigel if that was me , i would nt do it i would take the extra effort not to get the corals exposed to air...
why not take it from you sump area and the refuguim .there you can stop thewater flow and the top point ofthe tank and then take all the water frm those two area's will that will for ya ..
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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