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2. Live rock - Wikipedia

   en.wikipedia.org/wiki/Live_rock

   In J. Charles Delbeek's article Your First Reef Aquarium, [2] he states, The use of live rock immediately introduces into the aquarium numerous algae, bacteria and small invertebrates all of which contribute to the overall quality of the aquarium water. Live rock has just as much, if not more, surface area for bacteria than a trickle filter.

3. Airstone - Wikipedia

   en.wikipedia.org/wiki/Airstone

   A spherical airstone at the Osaka Aquarium alongside a trio of red stingray pups, Hemitrygon akajei. An airstone, also called an aquarium bubbler, is a piece of aquarium furniture, traditionally a piece of limewood or porous stone, whose purpose is to gradually diffuse air into the tank, eliminating the noise and large bubbles of conventional air filtration systems, and providing other ...

4. Aquarium filter - Wikipedia

   en.wikipedia.org/wiki/Aquarium_filter

   Activated carbon and zeolites are also frequently added to aquarium filters. These highly porous materials act as adsorbates binding various chemicals to their large external surfaces [2] and also as sites of bacterial colonisation. The simplest type of aquarium filter consists only of filter wool and activated carbon.

5. Tufa - Wikipedia

   en.wikipedia.org/wiki/Tufa

   Tufa columns at Mono Lake, California. Tufa is a variety of limestone formed when carbonate minerals precipitate out of water in unheated rivers or lakes. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits, which are known as travertine or thermogene travertine.

6. Pseudoplexaura porosa - Wikipedia

   en.wikipedia.org/wiki/Pseudoplexaura_porosa

   Pseudoplexaura porosa is a large species of coral, growing to a height of about 2.25 m (7 ft 5 in). The colony is tree-like, upright and relatively robust. It grows from a trunk that may be 5 cm (2 in) thick and branches dichotomously (forking repeatedly into pairs of equal-sized branches).

7. List of rock types - Wikipedia

   en.wikipedia.org/wiki/List_of_rock_types

   The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type.