OR....you could get proof (pictures etc.) of the sick & mistreated animals there and take them to the media...just to stir up some trouble. It might make a good story if you tell them how you were fired for trying to help sick animals.
I'd say take the evidence to Animal control but they usually don't care about reptiles.
If there is anything the nonconformist hates worse than a conformist, it's another nonconformist who doesn't conform to the prevailing standard of nonconformity.