Let him rest. Keep watch, and if the net does not fall off perhaps try catching him again and snipping more of it. A stressed cat tends to keep their barbs (on fins and body) extended, and this makes it harder to remove the net. Once the fish relaxes the net may come off by itself. Obviously, monitor the tank and remove the remnants of the hair net when it falls off.
You might want to do some extra water changes, and be sure to vacuum the floor of the tank extra well. Disease organisms linger in there, and a stressed fish is more susceptible to them. Keeping the water and the tank extra clean means fewer disease organisms to infect the fish.
You might want to do some extra water changes, and be sure to vacuum the floor of the tank extra well. Disease organisms linger in there, and a stressed fish is more susceptible to them. Keeping the water and the tank extra clean means fewer disease organisms to infect the fish.