They are only effective in salt water. They may be placed in the tank, hung on the side, or placed in a sump . Ozone , kalkwasser , and carbon dioxide are the most common reactors. They are typically a chamber water is pumped through with an injector for the additive. This filter provides both mechanical and biological filtration.
Water is drawn through the sponge, which removes small particles and grows bacteria.
This trace element is necessary for corals, clams, and other creatures with calcareous skeletons to grow. It is most commonly added as strontium chloride SrCl2. An additional water reservoir, typically under a tank, to keep equipment out of sight or increase the amount of water in a system. These are chemicals that are needed in small amounts by the aquarium creatures to survive, like vitamins. They must be replenished with food, water changes, or specific additives.