Also, I noticed 3, ~ 1/4" holes in the acrylic back that divides the display from back of the tank, a couple inches up from the bottom. I've found little info on these, aside from their purpose being to avoid running the pumps dry. Seems to me, however, that these would cause an equal water height between the display and all columns of the back, back the chambers and baffles pointless. I don't see how water would flow correctly, or at all, with these holes there. I'll have the ATO, so I'll probably be plugging then somehow. What did you do?