I main issue i see is they need about a 125 for themselves, with barely any rock work. So if you have a reef, I am guessing its fully stocked with corals and rocks which means only a strategically aquascaped 180 or 240 would be best for the ray. They are very prone to be picked on as well, a clown attacked my girlfriends stingray and beat him up. They will also knock over loose corals. It can be done, but with much caution. I don't think its worth it.