drgnfrc13;4508966; said:No, actually they don't, but even if that was true, it still wouldn't mean a thing in this case. Putting a 36-40" fish that is the girth of an adult man's arm in a 18" wide tank would just be cruel. Even a 2' width is still barely enough, tbh. An adult TT in a 150 gallon would literally not even be able to turn around.
Says the guy who has a pacu in his 220?

To the OP, you have a few choices, it largely depends on whether you plan on getting a bigger tank down the line... so instead of the rest of us assuming whether or not the OP will, let's just ask!
OP: What are your long term plans for an eel? Keep it in your 150, or are you going to upgrade at some point?

Your lack of experience keeping large eels is very apparent.