I've PMed you the thread with details on my eel.
I think he will get to about 20-25cm max. He's one of the small types and won't grow too big. I believe he is a striped peacock eel / peacock variant.
EEls are groundwellers, territorial and like hidey places. They can eat small fish that fit in their mouth but my eel hasn't eaten the guppies in his tank , just the occasional guppy fry.
I don't think eels are particularly difficult to look after compared to most other tropicals. My 14 yr old daughter took care of him , fed him every 2nd day, regular tank maintenance, that sort of thing.. BUT he will need a tank with a secure lid. He hasn't tried to escape but our last eel did, and succeeded!
See what other people think, if an eel would be suitable for you. Get back to me if you're still interested as I will put him on Trademe soon.