I'm at the end of my rope with this whole plumbing thing I just cant seem to get it right! I'm using a DIY weir style external overflow box, so I dont know what the GPH rateing is on it but it has a 1'' outlet. I redid my return plumbing and plumbed in a diverter but things still dont seem to be working like they should. I think maybe I should just get a overflow from reefgeek or something because my mag 7 puts it back in twice as fast as this dumb overflow can take it out! Is there a fool proof plumbing plan, or is it just trial and error?