I had one for a while, when I got it, it was about 8" long and about 1/2" in diameter ( if that big). After about 2 years, it grew to over 20" long and about 1 1/2" in dia. This guy was huge!! Came in from Church one Sunday and there he lay in the floor! It was dry, wasn't moving, so I got a Zip Lock bag and put him in it. My daughter yelled It's moving. I had just done a water change about 2 days earlier and still had the old water. So I stuck a heater in it along with a powerhead, put the SFE that was in the baggie, floating in the tank. After the old water came up to temp I floated the eel in the baggie in the old water then released it, after acclimating. After about 4-5 hours it started moving around. I thought it was going to live but quit breathing about 4 days later.