I never did get a response, but once on Ambergris discovered that fantasea did not seem in the mainstream of dive ops in the area, and were closed some of the time. I stayed at the royal palm just up the beach and ended up going out with bottom time divers who were pretty good. Protech may also be another good choice. seems to be alot of moving around with some of the dive ops. If you are interested in doing any of the outer atoll trips, Turneffe, Lighthouse, etc. (which I would recommend) you may want to look beyond Fantasea.
Hope that helps.