Man you are really making me consider drilling it myself. couldn't i just drill it and put strainers on it and not worry about a weir? then i would have more room in the tank and I could bump it up to 1.5 or even 2" pipe. How necessary is a weir??You really can't go over 1200gph regardless your drains can't handle it. So yeah I'd go smaller controllable and quieter.