The BOT Skimmer series by Planctonite is quite a departure from the cone skimmer craze which is still in full swing in the reef aquarium hobby. Instead of forgoing turbulence, the BOT skimmers actually have a Dynamo built-in that encourages full rotation of the water volume. The Dynamo is like a six-bladed impeller that is driven by the force of the incoming water and it encourages the water volume to spin. Planctonite claims that this near complete rotation of the skimmer body volume increases contact time by 300% and we can only take their word for it.