Originally Posted by Ziggy953
That is an interesting configuration and setup. You do not want to use the two lower center tank bulkheads as returns. If your pump is shut off it will drain the tank to that level.
If you don't want a CL
system on your tank then cap the bulkheads and just put an over the top return line. from what I'm seeing the top two holes on either side of the tank look to be a few inches below the surface of the water level and could cause a problem if ever you lose power or turn your pump off.
Good advice...what I ended up doing was using the 2 top bulkheads which do sit about 3" below the water level but I installed an anti-backflow valve just off the pump. Water can only flow to the bulkheads that way, and any pump failure will simply result in the valve closing. Tried it already and it worked perfect!
The lower bulkheads were capped, I can always remove if I ever decided to install a CL
system but for now it's just too much plumbing for where the display tank is going to be and would become an eyesore since it would cause the tank to sit at a much greater distance from the wall.