Many smaller species of dart frogs, especially thumbnail frogs of the genus Ranitomeya, utilize phytotelmata (water holding plants) to deposit tadpoles in. In captivity, film canisters are often used to replicate this niche. Use a soldering iron and melt a small hole in the side of a film canister to attach the suction cup, making it easy to mount the film canister to the side of your glass enclosure.