The Exo Terra Terrarium Screen Cover is an easy-to-install cover for aquariums and glass tanks. The strong metal screen provides ventilation and allows necessary UV penetration while ensuring reptiles, feeder insects and other small animals are safely secured. Screen covers are available in multiple sizes to fit most aquarium sizes. PT2714 Screen Cover Regular 30 Gallon Screen Cover – 36" x 12" (91cm x 30cm). Designed for 30/38/45 gallon aquariums