i'm making an overflow box on my 200 gal with two pipes going out to my 20gal. sump. my question is. how large should these standpipes be? my sexond question is how big should the powerheads for the two return tubes be?
They have to be able to drain more water back to the sump then the return pump is returning to the tank. So with that being said. a 1 inch pipe will drain about a 100gph and a 1 1/2 about 1600. so you can do the math on that one. On the PH's you kinda lost me on that one, can you explain what u want to do with them.