barryi:
Here's the deal with Bluespots: they frequently never eat in captivity and starve OR they eat , but only live fare and die of malnutrition, OR they will eat at first, but will stop eating for no apparent reason OR they will eat and seem to be doing fine, but die anyway for no apparent reason. I've read a lot about them and speculation as to why they don't make it ranges from tank size to water quality to types of food to noise levels....but no one agrees on anything.
I have two aquaintences I met through the LFS, both had their Bluespots die. The LFS warned me it would probably die on me--and mentioned one they ordered died in the store . In short, no one can believe she's still alive.
If you have a big enough tank and can commit it to the stingray alone and get lucky from time to time, yours could do well. Just don't get too angry if your new $90 pet dies on you.
Also, I still feel bad for getting one in the first place, given their touchy natures--and for contributing to the demand of an animal that frequently doesn't make it as a pet. I won't be getting another Bluespot for that reason.