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2. Recirculating aquaculture system - Wikipedia

   en.wikipedia.org/wiki/Recirculating_aquaculture...

   Recirculating aquaculture system. Recirculating aquaculture systems (RAS) are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity. [ 1 ] Other types of filtration and environmental control are often also necessary to maintain clean water and provide a ...

3. Marine aquarium - Wikipedia

   en.wikipedia.org/wiki/Marine_aquarium

   A marine aquarium is an aquarium that keeps marine plants and animals in a contained environment. Marine aquaria are further subdivided by hobbyists into fish only (FO), fish only with live rock (FOWLR), and reef aquaria. Fish only tanks often showcase large or aggressive marine fish species and generally rely on mechanical and chemical filtration.

4. Aquarium - Wikipedia

   en.wikipedia.org/wiki/Aquarium

   A freshwater aquarium with plants and various tropical fish. The underwater tunnel in the London aquarium. An aquarium (pl.: aquariums or aquaria) is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aquatic ...

5. 32 tips for taking care of fish - AOL

   www.aol.com/32-tips-taking-care-fish-080000438.html

   32 Top tips for taking care of fish. 1. Keep fish in a tank rather than a bowl. Two goldfish in bowl. You might have spotted the two terms being used interchangeably, but when you look beyond the ...

6. 32 best aquarium pets that aren't fish - AOL

   www.aol.com/32-best-aquarium-pets-arent...

   2. Red-Clawed Crabs. Red-Clawed Crabs. Small, colorful, and a lover of habitats with sandy substrates, Red-clawed Crabs are some of the best aquarium pets that aren’t fish. Also known as ...

7. pH meter - Wikipedia

   en.wikipedia.org/wiki/PH_meter

   A pH meteris a scientific instrumentthat measures the hydrogen-ionactivityin water-based solutions, indicating its acidityor alkalinityexpressed as pH.[2] The pH meter measures the difference in electrical potentialbetween a pH electrode and a reference electrode, and so the pH meter is sometimes referred to as a "potentiometric pH meter".