I would recommend you put some dirt over the coco fiber to cover it up if possible. That stuff is great for humidity but as I am sure your finding out it sticks to the frogs and gets tracked all over everything. Also if your dart frog is captive bred it shouldn't be much more toxic than any other frog so the poisonous label isn't necessary unless you want to impress someone... In that case you might want to try a different spelling of the word "poisonous ". Best of luck with your new frog.