my snake is sitll very small.. but the tank i have is a 50gallon tank.. i have been closing off half of the tank so its only has acces to one side.. would it be ok to leave the whole tank open for the snake to roam around? the heating pad i bout is not all that big.. it covers mayb 1/4 of the bottom of the whole tank.. would that be sufficient heat? or will the other side of the tank be too cold? my house temp is set to stay at 74f all day..