I use this to aerate my shrimp tank and its more awesome than you would think. If you keep shrimp and use any aerator you know that the splashing gets all over the place at a micro level leaving calcium deposits everywhere. This gem keeps everything in one confined space. I love it!
I should add, it can be used to diffuse co2 and comes with a silicone plug to plug the hole at the top. Its tiny so dont loose it like I did. You would only need this silicone plug if your going to use this bell to diffuse co2. Great product that really serves a purpose.