I would use a screen, as I do. The deep dome sits right on the screen as can the clamp dome but, the deep dome can hold larger bulbs and still sit on the screen. I use the other ones already suggested for my night lights and mini deep domes for added lights (for heating purposes or just adding more light to the enclosure).spyderk":1so6tok4 said:So it appears that the first suggestion won't just sit on the screen, but the 2nd will? Right now I do both clipped onto the tank w/o a screen on or place directly on the screen. I don't know what I'd like ... really I'd like an open tank w/no screen but I know that won't work as Puff gets bigger.