The pumps are rated in gal/hr @ no head, once you factor in the water head and the piping restriction each pump does 1200 gal/hr. Already in one day of the extra pump, fish are mush more active and water quality is perfect.are you sure the pumps are turnning over 2400gph and not 2400 litres per hour
Here are some more pics of some of my fish, I will take some close ups today and post.