It can work as long as the water depth is over 2.5inch.Features of the power filter pump:
1. Comes with 2 detachable sprayer tubes, make the water flow out like water curtain.
2. Water flow adjustable, there is a knob at the top of the filter, you rotate it to control the water flow rate.
3. Easy to disassemble and assemble the filter by hand, you take it apart to replace the floss sponges.
4. It can be installed vertically or horizontally in the tank.
5. with 4 small strong suction cups at the backside, it can firmly stay in place.