Hey guys so my boss is doing a in wall 800 gallon build in the office. He got the tank from a auction awhile ago. We are re sealing the tank. Question the previous owner drilled 4 2 inch bulk heads in one side of the tank. Kinda towards each corner were stumped with how to do the plumbing and over flows. I attached the pic you can see what I mean. Idk why anyone would put holes on the bottom but they did. Any info would help thanks.