40 gallon aquarium with a nice stand that I have been using as a terrarium for the past few years. If you want to use it as the original aquarium it holds water fine. It does come with the original hood for the aquarium, however, the light burnt out on that and I have been using an actually much nicer and brighter fluorescent shop light in the meantime, which you can also have, along with as many extra backup fluorescent bulbs as you want to take (I have tons).