Bromeliads are non aquatic plants designed specifically for vivariums. In the wild they are found growing on trees and as a result do not require much water in order to survive. Their colours are attractive and they often flower making them eye catching and a focal point. If you have an open top aquarium and your wood or any other deco protrudes above the water , tying or glueing a bromeliad to it would be ideal. They prefer occasional misting and warmth.