The first time I saw mine with his head under the water blowing bubbles I freaked out. The nose would pop up, BP would take a breath, nose would go back into the water, BP would blow bubbles... and repeat.
If you are concerned you can decrease the amount of water in the soaking dish.
Oh and definitely check it daily - the few of mine that do soak periodically also "go" in the water. At least clean-up is easy.