Okay, so to be honest, I just guessed how big Ollie's terrarium is. I honestly don't know!
It's by exo-terra, and it measures 11.5x11.5x11.5. Any idea how big that is? Is that around 5 gallons? Sorry!

Edit- wait, I just looked it up. It's 7.5 gallons. In the next 6 months, I will be upgrading my aquarium. My current one is 25 gallons, and pretty tall. Can he wait 6 months for that one, or is it necessary to get a new terrarium right now?