Well first of all you should do a search on this topic as it's been discussed from top to bottom. Basically it comes down to which problem you would rather, or rather not have. I've kept both, and I'm sticking with glass from now on with anything uder a 180 gallon. I did have a 250 gallon custom made with 3/4' plexi, and the first thing that happened was a rock tumbled down and put a gouge in it. If you get one little piece of sand between the plexi and whatever you are using to clean it with, stratch city!! I mean ANY piece of anyting harder than the plexi. You have to be really carefull with it. It's really a pain in large tanks to because there is so much surface are to clean.
Glass is heavy, and it can break. I don't walk around with my reeftank under my arms though, so I don't care. A 10' tank is very large however, and having it built on site is a practical solution to actually having to carry it in the house. Each pain on such a tank will weigh upwards of 400lbs.
For a tank that big, I would lean towards plexi despite the pain in the ass it is to have to be so carefull with it.
Jim
