Thanks high voltage, I have two pumps mostly because I had a coupon at Wal-Mart, and it came out I got two for the price of one, that and with two pumps I can really circulate the water to keep the shrimp kicking...I actually also have a b-15 aeroator that I'm gonna put on it as well, with two air houses. All this should add up to some really skipping around shrimpies.