first and formeost dont just jump into an eel purchase or you will regret it, as said they need "escape proof" tanks. Any chance given they will jump out and go carpet surfing, also IMO you should get a snowflake, herdy , great species . I would stay away from any morays though because they tend to be pretty aggressive and will eat aveerything in your tank. Also you need alot of rockwork , dens, holes, caves, etc for the eel to hide in to feel safe.
keep asking questions, your doing a good job
hope i helped :joy: