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I would guess you have critters under there. My son did his tank with sand and after a couple of weeks, he had crabs and other small critters appear.

Take a 30 ounce plastic tumbler, drill a few holes into the bottom of it about the size of a pencil, fill it with filter media and set it underneath the skimmer return. Bubbles will disappear. The tumbler was purchased at Kmart for 89 cents. Here are some pictures of our setup at...