tank not a good size?

[frankadank]

alright ladies and gents, my awesome manager was generous enough to gift me with a FREE tank cuz i work hard for him and he has no use for it anymore. he was a alligator/fish keeper and i believe this tank housed a baby gator but i am wondering if this tank will be good for my female bumblebee BP.

the dimensions are 4'L x 18"H x 13"W would this be sustainable for my full grown adult BP of course when she's an adult. i have her in a 20G now and he's not too sure on the G for his tank but that's the dimensions. i'm worried about the width only being 13" it looks kinda narrow like i'd have trouble getting a hide in i feel like. what's your guys opinion? is this strictly an aquatic tank? if i can't use it what would some of you use it for? she's 6 months old and 250Gs when do you move up to the next tank?