I have mine in my newt tank, with a submersed / internal filter. The filter is fairly week mind you, I think for either 5, maybe 10 gals.. The input is only about an inch from the sand and I've had no problems. The output is a positionable nozzle and it just sprays across the surface of the water, which doesn't stir up the sand at all. Of course, my newts do kick some up at times.
I wouldn't want to risk it with an expensive filter though..
Posted via Mobile Device