I like your idea from a simplicity standpoint, but it will have problems.



First, any pump that small with not have a lot of lift so the holes will have to be relatively large. As such, your pump will go through water very quickly.



Also, with the design you mentioned, it will take a lot of water (volume) to prime it. This will also waste water.



Perhaps find a pump you want to work with and simply run a small piece of aquarium hose off of that. Maybe just 3" or so sticking out of the water. Seal of the far end and then start poking holes in the tube until you reach the pressure threshold where your pump can force water through the holes.



This won't produce a mist, but rather thin streams of water that will leave water droplets on the cage walls.



Another choice is one of those in-cage foggers but that is not suitable for all species.



You're keeping Phelsuma, right?



If so, you'll want a system that leaves water droplets behind for the geckos to drink rather than just a fogger than increases humidity. But I think you've already realized that.

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