I have a 240 gal tank with 2 2" bulkheads on top. I also have a little giant pump rated at 2000 gph. My sump is a rubber maid 22 gal. Im afriad the sump might overflow if my pump goes out, since the 2 2"bulkheads bring down a lot of water and the pump also brings down water when its off. I was thinking of buying a 60 gal since I can get them cheaper from a friend, but I have to fill it up alteast 35-40 gals up for the pump since its a sumbersible. Do u think if the pump goes out the 60 gal will handle all the water coming down until the bulkheads cant get anymore water?