he is about 17 inches and thats what every tells me but my other eels keep him in check. i think if he was alone maybe. but this tank is a eel tank. i just raise the sharks in them cause its well established tank and bigger guys might eat the little ones in the big tank which is actually at another locatoin. i have a video of it somewhere on my computer. if i can find it ill get it on youtube and post it on here for you guys.