Hey guys, i have an hob overflow that has a 1" siphon tube. But it wont keep up with my return pump for my sump... The pump shouldnt be more than 700gph absolute max into the tank but its still nearly flooding the dang tank. From what ive read the gavity feed should be aroud 960gph... Even after i remove all the air from it, its not keeping up... Is there anything i can do to fix the problem?