I have a Zebra eel, He's about 2 1/2 feet long and hasn't eaten in 2-3 months, maybe a little longer. I've tried different foods, but he would only eat krill when he did eat. He doesn't have any physical signs of problems. He has fooled me a couple times where I thought he was dead, but then he moves to another spot. I have absolutely no Idea what is wrong. All other tank mates are fine, and all levels are good. Please help, I don't want to lose him. Thanks