- Eliminate dead spots in your aquarium with the cross flow pump. 2. This pump allows you to move water 360 degrees. 3. This compact pump is attached to the aquarium wall with magnets and only protrudes about 3 inches into the tank, making it very easy to hide. 4. The pump includes a controller which has several wave functions. CP pumps can go down to 1,998 GPH, or up to 100% power, 6,864 GPH. 5. Extra-long cable for ease and comfort of placement, even on larger tanks. Low supply voltage, safe and reliable. Suitable for fresh and salt water.