It draws .71 amps pumps 23 gal min.I'm not sure if the water exchange will be enough I have a large air pump hooked up .Its still better than buying a little giant for a few bills,if it doesn't work just cost me time.The tank size is around 250 gals .I will be looking for a larger tank this summer,if I go that way I will have to spend some cash and splurge for the bigger pump.Its working so far??