Sorry, I missed you. I am cleaning out a 25 usg Eclipse tank and setting it up for a Badis badis and queen loach tank. I am also looking at 30-40 usg 30" tanks. Yes your cory could be slower to heal due to age. I'm glad to hear the tank is perking up, What are you doing to help his sores heal? Do you have the Mela/PimaFixs?