I've had my tomato for about a week now. He's moved around on some nights, but not too often. From what I can gather it's perfectly normal for these frogs to bury themselves for days on end without moving. They don't stalk their prey, they wait for them to come towards them. I have found though, that my frog moved around more when I added more hiding spots in his tank. Seems they have less of a need to bury if they can hide under half logs or plants.