hi mattbl

.. are you sure its tb??what are the symptoms?have you tried any medicines?if they are skinny and dont seem to be eating properly it could be internal paracites..(skinny disease)..what type of fish do you have?i wouldnt just give up on them and wait for them to die..

..you can at least try some medicines..i used sterizin made by waterlife when my clowns had the skinny disease and they are fine now..it cant harm them any to at least try some type of medication that is recomended for the symptoms of your fishies...