I wonder how they safely control the salinity of that outdoor tank when it rains? Maybe it just doesn't rain enough to cause dilution. Maybe it just rains enough to keep it about right with evaporation...hmmm...
Did you notice the huge surge tank above the reef display?
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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