10-15 outlets, you making a CL (pump drawing from display) or a return manifold (picture here)?

If you are making a manifold, there will be head loss.

Corix is in Richmond off of River Road near Home Depot.
Gray pipe they use for electrical conduit look at Home Depot or Revy in the electrical section. Limited fitting though you might have to use some white.

its not a return manifold. It is a closed loop manifold. It will have something like that photo on the top, but also a manifold in the bottom of the tank. I am going to draw something up so I can show exactly what is happening.

I am going to attempt to do my drilling this weekend. What is the safe distance between the bulkhead and the edge of the glass, as well as the distance between bulkheads?

I need to have three going across the top of section of the tank, which is about 18" in length. The bulkhead sizes are 1" .

Have read (caution, on forums) with glass that should not drill closer to the edge than the diameter of the hole. (3" hole, edge of hole to edge of glass not less than 3")

btw, my tank was from Bow Valley and seems they followed this rule.