I've seen tanks absolutely packed to the gills and kept successfully. I guess you just need to do research as to what species react negatively to close quarters with others. I'll lend you my coral book (Eric Borneman) because it has a lot of good husbandry info.
Rich.
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90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
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