So your favorite Manufacturer Octopus has relased this line of BioPellet Reactors designed for the use of solid carbon dosing biopellets. With the use of these media reactors keeping your nutrients low is a breeze. Each reactor utilizes a fluidizing cone bottom design to keep the biopellet media in suspension and evenly dispersed in the water column. Each reactor comes features that help with maintenance, such as fastening screws to keep it water tight. A mesh screen keeps the biopellets from entering the plumbing line. We offer 3 different sizes for use with many different aquarium sizes.Biopellet SizingWe recommend Roughly 500ml of Warner Marine Ecobak per 100 Gallons.