I'm being extra cautious with everything that goes into my display tank. When you loss thousands of dollars in livestook, more than once in 12 years. You vow to do thing properly and never let that happen again. I think the eel looks good too. Its the scratching that makes me nervous, if you said that eels commonly scratch then my mind would be put to rest, but I realy think he's got something. If eels get different illnesses then fish, then it may not transfer to fish. I'm going to add a cleaner shrimp today to see if that helps the eel get rid of hitchhikers.