Hitchhiker Eel ID please

[iishanreef]

hey everyone, i discovered this eel im my reef tank. must have come with some LR i got a few years back. i would like help to ID so i can decide how to deal with it. it is about 6-8 inches long and i must have had it for 4-5 years in my tank (without even knowing it... although now i know where all my gobies and shrimp went lol). Thanks a bunch