thank you chrismhaase i think sch 80 is deffinetly the way to go.. it looks like i will only have about 1/8th slop on both holes, i will deffenitly feel safer with those..
salty55 this tank is deffinetly not your normal tank, and deffinetly is not your average reef tank.. i have only seen like 3 or 4 that are close to my dimension's...
as for the flow into the sump.. i have decided to use the hole at the top for my overflow into the sump.. there is a good foot from the bottom of the hole to the top of the sump.. i don't think i will have any problems with this.. im gunna run the pipes almost to the bottom of the sump so that i won't have alot of splashing, so in all reality there will be about a 3' drop.. im gunna use the overflow that is in the tank for the closed loop.. if i run into a problem were the water going into the overflow cant keep up with the closed loop then i will drill some holes lower then the large hole at the top of the tank.. until i get some water into this beast i really won't know if my ideas are gunna work...