Hi Marie and welcome to fishlore,
Yes remove the pea skins. The swim bladder can get 'bruised', and can recover, but this sounds like something else to me. Did you have aq. salt in the tank they came from? This should not cause these conditions, but might weaken him if not used to it. Usually it will cause the fish to sluff its slime coat and produce more because it is an irritant. It might have caused stress, as it sounds like the whole move was a bet stressful on both fish, which given their age I can see...
You said the tank had been up and running for 3 months, but did you do tests with a Master
test kit to see if the
ammonia, nitrites and nitrates were right? If there was an algae bloom I would worry that the tank may have bad water conditions, and need more than just 25% water changes. Several 25 % changes a day for a few days would be good just in case.
What are the water parameters?
If the peas don't help, I would suggest withholding any food for several days. This will not hurt, and it would be harder on your fish to allow him to eat anything if there is an obstruction.
Our prayers are with him....
