Gary B

Recently purchased a golden mystery snail. Not sure how but it seems as if it has an air bubble in his shell. It always floats to the top. i've tried putting down in my plants but it always gets out and floats to the top. Rarely I've seen it attached to the side of my tank close to the top but then it's floating again. I've tried gently pushing on his "foot" or "trap door" to try to release air but with no success. Any suggestions? I'm afraid it will just slowly starve.