Con...the potential for skimmer overflow and floods.
I'm also very interested in the hanging frags. I've never thought of doing that. In my case, I constantly fight with hair algae taking root on the frag plug and the frag has to fight with hair algae for real estate. My frag rack itself also has to be boiled/replaced so often it drives me nuts...
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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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