i had a rope fish (reedfish ) that jumped out he was as dry as cardboard when i found him i put him back in and about 8-10 hours latter he came around
i pushed him up and down by the power head to force oxygen into him and it worked
.sadly a week latter he got out again and i was to late
Sorry about your loss. Although not applicable to your ray pool, I seal up all of the holes in my tanks with clear packing tape to prevent any polypterid escape attempts.