Don't put him on the floor! He's absorbing everything you track into your house on your shoes and what not. Did you use dechlorinated water to prepare everything in the tank? Answer the trouble in the enclosure questionshttp://www.frogforum.net/showthread.php?t=14721 and post them back here so we can get an idea of what's wrong.

If you want to let your frog out of his enclose to exercise buy a big plastic bin and put some dechlorinated water in it with paper towel down on the floor and let him hop around in there for a little bit

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