I personally think the small ultrasonic foggers are worthless. They spew water drops around at high velocity, can be dangerous to your frogs, and crap out after a couple of weeks. While they don't work well with distilled water, hard water cruds them up quickly. The one I'm thinking of is a fat little disc that works only under an inch or so of water, which it quickly dissipates. As lovely as fog is floating around in a tank, these little ultrasonic fogger discs just don't do the job. Until I can get something for technically feasible to creat fog outside of the tank and push it in, I've just resorted to hand misting, using one of the simple pump sprayers for home and garden. You can get 2.5 pint ones that are easy to handle at any nursery. Mine are RL Flomaster Premium, home and garden sprayer.
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Patty
Pahsimeroi, Idaho
4 D. auratus blue
5 D. galactonotus pumpkin orange splash back
5 D. imitator
6 D. leucomelas
4 D. pumilio Bastimentos
4 D. fantasticus
4 P. terribilis
4 D. reticulatus
4 D. castaneoticus
2 D. azureus
4 P vittatus