I can't see much value in acrylic if you are thinking of (only) 180 gallons. I think the benefits of acrylic outweigh the challenges only once you get into very large size tanks. At that point, glass starts to become too thick and heavy for my taste.
My acrylic tank is scratched to heck...and not a single scratch was caused by me. Tangs, triggerfish, urchins...they all leave their marks on the acrylic.
If I had to rebuild my 400, it would still be acrylic. If I were to build a 180...it would be glass (starfire).
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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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