so, its been 44 hours, I have an air stone running at the bottom of my tank(not in the water column) which is making the top of the tank and the bottom having a 6F TEMP DIFFERENCE!!!(bottom 75.6!!, AND TOP IS 79-81??!!!!) can I move the air stone to my water column(its an aio tank) or can I turn it off for the remainder of the 3-4 hours?