I remember i was faced with a similar scenario too.. I couldn't bear to see the fish die, nor could I bear to see it suffer.
after much consideration, i decided to release it back into the sea (of course, not just any spot along the beach, but a one where I had physically seen thriving reef life).
I thought to myself.. it could be because I did not do a good enough job of creating the ideal habitat for it, that it was suffering.
So I decided to give it back to a habitat created by nature herself. Perhaps the better environment could reclaim its health?
Of course, i know there there were risks too.
- that it gets eaten by predators
- that it cannot get used to the new environment.
but i thought, if it were to be eaten by a predator, hopefully the death would be swift & it would have contributed back to the food chain.
whether or not it can get used to the environment was a 50-50 which i was willing to take a bet on, in lieu of the possible advantages.
guess what happened the day I released it?
It swam on the surface a short while, probably a little lost, then quickly, dived towards the corals and other fishes as though it forgot its ailment..
I have never seen it so happy before..
I left the spot with a prayer for the friend, & a smile..