Some people have tried to patch the tank with JB Weld but more than likely you will have to replace the tank. This will be expensive as they will have to cut out the cabin floor and or galley floor.
The best marina in the MD area might be:
Haven Harbor Marina, Rock Hall MD.
www.havenharbour.com/
More south on the bay away from Annapoli$$$ is...Zhanizer
shmarinas.com/locations/safe-harbor-zahnisers/
Then if you want to go to Annapolis, MD then use, BERT JABINS
www.bjyy.com/
Working out of Bert Jabins yard is a fantastic service compnay called:
Diversified Marine Service
www.diversifiedmarineservices.com/
This team is AMAZING and can do anything
Let us know how it all goes.
Hayden