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.
Water is dripped over some media which is also exposed to the air.
This promotes very efficient nitrification. The water may drip from a spray bar or drip plate. The medium may be small pieces of plastic, DLS , or anything else which will support bacteria and not easily clog. UGF See under gravel filter . A device which uses UV light to kill bacteria and other tiny organisms.