overflow help

[Aquaria]

siphon its from here http://www.angelfire.com/ab/rayjay/DIYoverflow.html and pump is a rio+ 1700 442gph @3ft thinking of making a small half ft shelf for the sump to sit on so i can get 500gph and going with 1" abs i think cuz i want black

[Aquaria]

although a 3/4" pipe would match the pump a little better going off the chart anyway