I don't know if there are any true species of freshwater eels available. However, the ones that are but aren't true eels are tire track eels, fire eels, spiney eels, and a few others that are less common.
They don't have any special needs, except they'll hide in every possible niche they can find (they often end up inside your filter/sump). Large eels will eat fish, but smaller ones prefer worms.
Many will grow over 2ft, however, that'll take years and years. Eels over 2ft are actually very rarely seen and those that are are often very old.