I treated the fish this morning with what i had available, i was bitten by a spider earlier this week and was given an anti-bacterial balm (bactroban) to heal my bite mark, i used this on the fish in conjunction with an anti bacterial spray, how good the spray is im not sure but the balm is really effective. I prepared the wound area as per the article, i tried to get the balm as dry as possible before putting the fish back but the balm doesnt dry out.
I will just keep doing this process every 2 days and hopefully it will recover.