overflow help

[mark]

though always see 1" is good for 600gph there's been some discussion on RC is it for a gravity or siphon (this thread post 1644 is a table)

[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