Don't use a cellulose sponge. You can use a natural sea sponge which has enzymes that inhibit the growth of bacteria, mold and mildew.
I keep a wet sea sponge in a dry water bowl in the tank and it provides enough humidity for clean sheds. I rinse it out weekly and soak it in CHD once a month. They last a very long time. You can buy them at Home Depot in the paint department.
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