new tank help
 

hello all

well my 56 gal is filling out fast.so i bought a 75gal and had a herbie put in it. 2x1.5 and a 1" return.
i want some good flow in it it,ll have have 2x6065 tunze powerheads
sump is a 40 gal breeder what size pump should i go with i have a mag 18
i was looking at a dart pump. this one.http://www.jlaquatics.com/product/wp...500GPH%29.html
is this going to be to much for a 1" return. or should block the retrun and come over the top with an oceans motion. i don,t realy want to block the return, i dont want to blow up the pump or any plumming.
thanks for the time.