Ive had this Fire eel for about 14 years. I do a partial water change every couple of weeks, Have a power filter that I keep good carbon in. He is about 2 feet long and has always had a good appetite eating 5 bloodworm cubes a day. About 4 days ago he stopped eating. He will come out of his rock shelter that I have constructed for him, he will act like he his hungry. But will not eat the Bloodworms. The temperature is a steady 80 degrees. I have a testing kit that shows 0 Ammonia and 0 Nitrates in the water And 0 Nitrites.. I dont know the life expectancy of these Fire eels but he has become a part of our family. Any help would be Most appreciated!! He is also the only fish in the 50 tank..