Hi mate. I think it all depends on what they get use to. I had rays years ago that i fed raw and cooked, they never took pellets. I now have rays that have only ever been fed raw prawns (and mussel). They love them shells on or off. They also love pellets. But i have the young hybrid she was on pellets when i got her. I have put her on raw prawns to fatten her up. She has grown an inch in a month easy. But now she won't touch pellets! But i found this with the other rays when they were young, same thing happened. But i always take prawns out the freezer the night before i need them and put pellets in the same container and leave in the fridge over night. The pellets obviously get wet from the prawns and expand. This got the young rays back onto the pellets and they now eat them either soaked in prawns or dry. I am sure the young hybrid will follow suit when i add her to the other rays.I know someone else that throws food in frozen, i've always been opposed to the idea myself, it just doesn't feel right somehow?
I can say though, after this topic i did try the rays on cooked, raw, shelled and unshelled prawns and they seemed to prefer cooked and with the shell off
Hope everything is ok T1