a drain hole in the return section, humm-m-m....would work I suppose. Maybe would lose a little fresh water out drain hole but should be negligible compared to 230gal. but if pumps were shut off(power outage) All the water from pipes and to top of overflow would drain out too.
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Rico's Reef - Born 07/15/2006 - 75 gallon reef, 29 gallon sump/fuge
Polly's Ocean - Born 11/24/2007 - 10 gallon mini reef
Rico's Moneypit - Born???(coming soon) - 240 gallon mixed reef
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