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  2. Calcium reactor - Wikipedia

    en.wikipedia.org/wiki/Calcium_reactor

    A pH controller is recommended to control the CO2. It works by connecting to the CO2 regulator on the CO2 tank and measuring the pH of the solution inside the reactor via a pH probe. The controller will turn on and off the flow of CO2 based on the pH inside the reactor. The pH range for the typical calcium reactor is 6.5–6.8.

  3. Recirculating aquaculture system - Wikipedia

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

    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 (NaOH). A low pH will lead to high levels of dissolved carbon dioxide (CO 2), which can prove toxic to fish.

  4. Freshwater aquarium - Wikipedia

    en.wikipedia.org/wiki/Freshwater_aquarium

    A freshwater aquarium is a receptacle that holds one or more freshwater aquatic organisms for decorative, pet-keeping, or research purposes. Modern aquariums are most often made from transparent glass or acrylic glass. Typical inhabitants include fish, plants, amphibians, and invertebrates, such as snails and crustaceans. Tropical freshwater ...

  5. Marbled hatchetfish - Wikipedia

    en.wikipedia.org/wiki/Marbled_hatchetfish

    The marbled hatchetfish is common in the aquarium industry. It represents one of the largest exports of freshwater ornamental fish from the Rio Negro Region with about 400,000 exported annually. Like most Amazonian fish, the species prefers softer, acidic water within the pH range of 5.0 to 8.0.

  6. Hypoxia in fish - Wikipedia

    en.wikipedia.org/wiki/Hypoxia_in_fish

    The anodic isoforms have low oxygen affinities (high P50) and marked Bohr effects, while the cathodic lack significant pH effects and are therefore thought to confer hypoxia tolerance. [75] Several species of African cichlids raised from early stage development under either hypoxic or normoxic conditions were contrasted in an attempt to compare ...

  7. Freshwater environmental quality parameters - Wikipedia

    en.wikipedia.org/wiki/Freshwater_environmental...

    pH in rivers is affected by the geology of the water source, atmospheric inputs and a range of other chemical contaminants. pH is only likely to become an issue on very poorly buffered upland rivers where atmospheric sulphur and nitrogen oxides may very significantly depress the pH as low as pH4 or in eutrophic alkaline rivers where ...

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  9. Apistogramma panduro - Wikipedia

    en.wikipedia.org/wiki/Apistogramma_panduro

    A. panduro spawn in water with a low pH. The breeding pair can be fed a variety of live food, frozen meaty foods, and flake food. [2] Females are very devoted to their young, and they care for both the eggs and larvae. [3] An ideal breeding aquarium includes rocks, moderate lighting, fine sand, caves, and live plants.

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