The first sign of an ill frog is usually when it refuses to eat. I wouldn't worry but do keep an eye on them. Since they're new, try to keep them in a part of the house that doesn't get very noisy or a heck of a lot of traffic. Which Petco did you get them from? The Frisco one? I've been to the mall there by 121 and Preston but never gone further up Preston to the Petco. I did notice that the Petco in west Plano had some very nice White's a few weeks ago - I had never seen any that nice in a chain store before.