Over here, removing the shell and feeding raw prawn meat is a common thing to do if you want to pump up fishes.
Just make sure you rinse it well and that your biological filtration is established else it could mess up your water.
cloudy eyes is a symptom of ammonia poisoning along with red streaks and decaying fins. i recomend a water change to prevent further infection but as far as treatment you need some ammonia neutralizer
i think it made a 100 percent recovery i didnt do to many water changes cus i felt like it was unneed my water is perfect and my filtration is very very powerfull everywater change i did it would get worse it would be super stressed out i thought it dead a few time so i just gave him a strees free tank with great water and hand feed him when he was ready know its a monster he will eat when foods in the tank i even hand feed it