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[SmackoftheGods]

Pictures may help....

I wouldn't use potting soil as a substrate in any of my tanks. Most potting soil contains high amounts of nitrogen and phosphorous to encourage plant growth and I'm a little concerned about the frogs absorbing it. I've decided to use the pots in my new tanks so I can put coco fiber over the top of the potting soil so the frogs walk across the coco fiber and my plants still get the benefit of the soil.