From what I know, they stress kind of easily. They have the ability to release toxin when stressed, and guaranteed when they die. I remember reading someone had a sea apple (or brightly colored cuke, but still same effect) in a shark tank, and it died and nuked every one of his sharks.
I would say to be VERY careful if you must have it, but it would be quite possibly the only time I would take the 1/2 store credit at my LFS.