There is a fantastic product for aquarium users called Easy Balance. Reduces the need for water changes. Also, there should be enough natural evaporation which requires you to add extra water right? I'm planning on putting a torched PVC pipe (with wide notches at the bottom ) behind my background so I can siphon it if I need to. Torched PVC looks awesome if done right too! I use it in all my tree boa cages.

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