lol its holes haha the top ones behind the box are drains and the other 4 are for the closed loop, the return is going to come up over the back with lock line so that you do not see anything in the tank.
Question----i am now thinking of just doing 1inch pvc for the drain....what do you all think about that, since my drain holes are 1inch would i get more flow if i used wider pvc, even though my return pump will only be able to push 850 gph.