I like the book by John H. Tullock entitled "Natural Reef Aquariums - Simplified Approaches to Creating Living Saltwater Microcosms." It's very informative and has a very comprehensive section on berlin style sumps: from construction to understanding the principles and theories behind their use.
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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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