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There are small gaps on the top of his tank for clips and he slipped out through them... I didn't notice the gaps until this morning

Found him!! He was in the bathroom on the floor and had dust and hair all over him. He looked like he wasn't doing too good, but after his bath he looks good now and is exploring his home. I have to modify yet another tank to keep a tree frog in. Fish aquariums are just not meant for frogs.