I use a reptile humidity pad.
Its this gelly stuff in a bag that you soak over night and it soaks up a bunch of water and you just leave it on the hot side of the tank. The heat slowly evaporates it into the perfect amount of humidity. It lasts about a week or so before having to remove for a nightly soak. But its SO much better then a sponge that you have to refill every day or so.
I also use a mister to spray when needed, like when the humidity pad is almost flat (out of water).
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