i have never had a problem with mine gettinng along but i use to also have a peacock eel but he got out of the tank just be careful becasue eels can get out of a tank easy make sure no openings in your lid otherwise your have a dried eel on your floor but any spiney eel would work out fine fire eels get big though so be warned so do snowflakes and they can deliver a nasty bite i have one never bit me yet but i have heard of others being bit bad but if you want a real moray eel the snowflake is the way to go but make sure you use aquarium salt