I bought this for the shrimp tank. The tank is next to a microwave in the dining room in an awkward spot where there's not a lot of room (none) for a vibrating air pump to be hopping around. I'm delighted to not have the old one sitting on top of the microwave anymore. http://www.amazon.com/dp/B0158FDIEQ/?tag=wafishbox-20 It came with a round airstone that I'm not currently using. I hooked it up to a sponge filter that previously had a way way way too powerful airpump on it. So far, so good. I love the "no footprint" and the bubbles are perfect.