It is a 50 gallow bow front aquarium that came with a hood / light canopy that I modified quite a bit. I cut out air ventilation ports into the hood that I covered and sealed with mesh screening. This allows me to control quite well the amount of humidity that I want to remove / remain in the enclosure by leaving them opened / closed. I also cut out air holes in the light canopy so I can control how much heat is allowed to be contained / removed from the CFLs.