The fish keeping standards are higher over there.
I remember going to Germany and the fish store there would not sell me a clown loach and an angel fish togethjer as they would "not be friends", and I had to buy three loaches so that they would be "happy".
You should have seen the ladies face when I told her I wanted to put a chanel cat in with them.
It still makes me laugh to this day.
That being said, i dont keep rays, but have always wanted to.
Good luck!