I recently purchased a 14” fire eel. It has been in quarantine for about 2 weeks. Still will not eat, and has a small fleshy growth on the base of the pectoral fin. Not sure what i should do. i water test every day (always 0) i do water changes with prime 2 times per week. the tank is 60 gallons. I try to feed night crawlers, cut up frozen shrimp from kroger, blood worms, and carnivore pellets.