Review on Zilla Fresh Air Terrarium Metal Screen Cover with Hinges (30 X 12 Inches): Superior Ventilation for a Happy Habitat by Robert Gilbert

I put this on a standard 20g aqueon and the fit isn't perfect but considering this lid was probably made specifically for the Zilla terrarium that's to be expected. The lid is approximately 1 cm lower (facing the aquarium) than a standard 20 liter aquarium. So if you have a backdrop for your animals to climb into, you need to fill that gap. I used rubber tubing from a local hardware store. The flip open design is great, I prefer the Zilla lid which has a door in the middle of the screen. This lid allows you to reach anywhere in the aquarium while leaving it open, which is especially handy for lamps.