SWC has a new pair of media reactors they have just released. 80mm diameter. These new media reactors feature a cone at the base. This cone design helps spread the flow evenly across the bottom to help prevent channeling in the media. This feature would really be appreciated when tumbling a media such as bio pellets. The SWC reactor also come with acrylic plates that can be locked into place to adjust the tumbling chamber Good for tanks up to 250g.