Sponges are totally disgusting and will get rank very quickly, especially in an enclosed space regardless of how many holes you have. Sure, you could squeeze the sponges out and disinfect them every day, but if you ever forget or have to go away or something, I think it will be nasty. JMO.
Get bigger water bowls or turn the air filter down/put it on a timer/don't have it on so much.
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