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  2. Calcium reactor - Wikipedia

    en.wikipedia.org/wiki/Calcium_reactor

    If the probe detects a low pH level, the pump activates. The bubbles raise the pH by dissipating the CO 2 gas. Since the pH inside the reactor is much lower than the pH in the aquarium, you run the risk of lowering the aquarium pH by running a calcium reactor if that low pH isn't mitigated.

  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. Substrate (aquarium) - Wikipedia

    en.wikipedia.org/wiki/Substrate_(aquarium)

    For freshwater aquaria, gravel is the most common substrate. To prevent damage to fish, gravel should not be sharp. Aquarium gravel can be as coarse as pea-sized or as fine as 1–2 mm. [1] It is available in a number of colors, and may be naturally colored or dyed, and may have a polymer seal to ensure it does not affect water chemistry. [1]

  5. Refugium (fishkeeping) - Wikipedia

    en.wikipedia.org/wiki/Refugium_(fishkeeping)

    In fishkeeping, a refugium is an appendage to a marine, brackish, or freshwater fish tank that shares the same water supply. It is a separate sump , connected to the main show tank. [ 1 ] It is a " refugium " in the sense that it permits organisms to be maintained that would not survive in the main system, whether food animals, anaerobic ...

  6. Freshwater acidification - Wikipedia

    en.wikipedia.org/wiki/Freshwater_acidification

    Wetland restoration projects have been shown to increase the resilience of freshwater systems to acidification and other environmental stressors. [20] Liming is one of the most common and best practices for remediating acidification. In this process calcium carbonate (CaCO 3) is added to the system to increase pH levels. [21]

  7. Aquarium - Wikipedia

    en.wikipedia.org/wiki/Aquarium

    This aquarium features a heated tank and a glass-enclosed top for warmth during winter. Some aquarists modify water's alkalinity, hardness, or dissolved content of organics and gases, before adding it to their aquaria. This can be accomplished by additives, such as sodium bicarbonate, to raise pH. [69]

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