flowers are one of the most notoriously difficult rays to raise (no pun intended) I have kept two, after having kept rays for years, and still found them to be the most stressful to get totally stable.
Flowers are one of the few species of stingray that are almost impossible to breed in captivity, because of that, 99% of the ones coming into the US are wild caught. This means that they have a much higher chance of having parasites, which can lead to decreased appetite and eventually death. Both the flowers I kept, came in with parasites even after the wholesaler (whom I trust) had treated them.
Since you've only had her a day, I would let her relax for at least another 3 with low lights, no tank mates, and pristine water. After a while, try throwing in some black worms. If she eats, great, if not, you may have a problem, but I have had pups starve themselves for a week before eating and then turn out great, so you never know. If you notice green stringy feces in the tank, this is usually a sign on internal parasites, in which case, you should treat with Prazi Pro. Hope this helps, good luck with her, they are IMO one of the most beautiful rays and very rewarding to own once they are stable in your tank.
