Fish that can live with eels?

ok i have a thirty five gallon tank with a dragon fish and a sucker fish(plecostomous or whatever) but i want something that actually moves lol, and medium sized and looks cool and interesting. Also put in mine i forgot to tell you that i also have a fire eel bout five inches, so it has to be able to live in that the other fish are about three maybe two(sucker) and the dragon is like 4. So please help me find a fish, oh by the way my eel eats little fish found that out as soon as i got it lol.