This is a good question.... I keep springtails in all my tanks, including my big-eyed tree frog tank. They help with the waste, may it be fecal waste or dead feeders like crickets. I also have a drainage layer for the plants. So I personally let my little eco-systems clean themselves. I once asked John Clare, the founder of this site, and said that he personally removes the excess water when needed from the drainage layer, and will change the substrate if needed once each 9-12 months.
Make sure though that the water in your bowl is changed daily!
Eric






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