i lived in grand cayman for a few years and it is safe to say that most fw stingrays dont get nearly that size. most get too big for your "standard" aquarium. they are very sensitive and need 84 degree water of pristine quality. they need peaceful tankmates that they cannot swallow too, and yeah the price is ridiculous, especially for the black ones.When I got back into fish, I was going to keep fw rays. I did some research and found that you need a pretty good size tank (my wife thinks that my 46 is enormous !), so I kind of decided against it. Still think they're cool. Have ever since I went scuba diving at Stingray City in Grand Cayman and the rays were as big as VWs ! It was awesome !!