Would you guys say tubs are better then tanks for babies? I knwo this will sound stupid but is a tub just a simple plastic tub encloousure?EDIT-Also if I buy a thermstat what would you guys suggest for equipment to hook it up to for heating systems? My biggest mind boggle is hwo to keep heat different from ends of tank on a 20 gallon considerign it is not that big. But the heat lamp may be throwing me off.