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  2. Recirculating aquaculture system - Wikipedia

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

    The first step of nitrification in the biofilter consumes alkalinity and lowers the pH of the system. [11] Keeping the pH in a suitable range (5.0-9.0 for freshwater systems) is crucial to maintain the health of both the fish and biofilter. pH is typically controlled by the addition of alkalinity in the form of lime (CaCO 3) or sodium hydroxide ...

  3. Ammonia poisoning - Wikipedia

    en.wikipedia.org/wiki/Ammonia_poisoning

    Schematic representation of the flow of Nitrogen through a common aquarium. Ammonia poisoning is a common fish disease in new aquariums, especially when immediately stocked to full capacity. Ideally, the level of ammonia (NH 3) and ammonium compounds (i.e. those containing NH 4 +) in fish tanks should be zero.

  4. Oscar (fish) - Wikipedia

    en.wikipedia.org/wiki/Oscar_(fish)

    The oscar (Astronotus ocellatus) is a species of fish from the cichlid family known under a variety of common names, including tiger oscar, velvet cichlid, and marble cichlid. [2] In tropical South America, where the species naturally resides, A. ocellatus specimens are often found for sale as a food fish in the local markets.

  5. List of freshwater aquarium fish species - Wikipedia

    en.wikipedia.org/wiki/List_of_freshwater...

    Many color and tail pattern varieties exist. They generally need a ratio of 1 male to 2 females or more. All guppies and mollies are hardy fish that tolerate lower oxygen levels and temperatures than most aquarium fish, give birth to live young, and readily breed in home tanks. [58] can live in full sea water [59] 66 °F - 84 °F (19 °C - 29 °C)

  6. Community aquarium - Wikipedia

    en.wikipedia.org/wiki/Community_aquarium

    Most freshwater aquarium fish do well in water that is soft to moderately hard, and that has a pH between 6 and 8. Brackish water aquaria are a special case and need dedicated community tanks. While a few freshwater and marine fish can adapt to brackish water, most cannot.

  7. Paratilapia polleni - Wikipedia

    en.wikipedia.org/wiki/Paratilapia_polleni

    P. polleni is temperature- and pH-tolerant (in the aquarium the temperature should be of 72-80°F, pH: 6.5-8.0). [3] Thus in captivity, it is reasonably hardy and rarely shy. As such, this fish is an ideal aquarium resident if given the appropriate environment [3] and tank mates considering its formidable

  8. Jack Dempsey (fish) - Wikipedia

    en.wikipedia.org/wiki/Jack_Dempsey_(fish)

    The fish is a popular aquarium fish, due to its striking appearance and personable mannerisms. It, like most cichlids, is considered "aggressive", [6] but can get along in a well-populated tank, tending to be more territorial if kept with only a few other fish, therefore allowed to easily establish and defend a "territory" in the tank. Jack ...

  9. Talk:Oscar (fish) - Wikipedia

    en.wikipedia.org/wiki/Talk:Oscar_(fish)

    The lead asserts that Oscars are slow growing for aquarium fish, this is simply not accurate. Oscars grow at a rate approximately 1.5-3cm per month - around an inch - until they reach about about 20cm (8inch). Within the Cichlid family (the family the Oscar is in) there are hardly any varieties that match this rate of growth. Even speaking of ...

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