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  2. Refugium (fishkeeping) - Wikipedia

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

    The refugium light cycle can be operated opposite to the main tank, in order to keep total system pH more stable (due to the uptake of acid-forming CO 2 by photosynthesis occurring in the refugium during its "daylight" hours). One volume guideline for a refugium is 1:10 main tank volume.

  3. Calcium reactor - Wikipedia

    en.wikipedia.org/wiki/Calcium_reactor

    The controller closes the valve as the pH falls below this level. Dual chambered calcium reactor. Some pH controllers have an interface for an air pump. This air pump is connected to an airstone in the sump or main tank. If the probe detects a low pH level, the pump activates. The bubbles raise the pH by dissipating the CO 2 gas.

  4. Ocean acidification - Wikipedia

    en.wikipedia.org/wiki/Ocean_acidification

    An in situ experiment, conducted on a 400 m2 patch of the Great Barrier Reef, to decrease seawater CO 2 level (raise pH) to near the preindustrial value showed a 7% increase in net calcification. [113] A similar experiment to raise in situ seawater CO 2 level (lower pH) to a level expected soon after the 2050 found that net calcification ...

  5. 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 ...

  6. 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]

  7. 10 pretty tropical fish that could brighten up your aquarium

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    These tropical colorful fish will make an exotic addition to your fish tank, you won’t be able to peel your eyes away! Skip to main content. Subscriptions; Animals. Business. Fitness. Food ...

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  9. Reef aquarium - Wikipedia

    en.wikipedia.org/wiki/Reef_aquarium

    A reef aquarium or reef tank is a marine aquarium that prominently displays live corals and other marine invertebrates as well as fish that play a role in maintaining the tropical coral reef environment. A reef aquarium requires appropriately intense lighting, turbulent water movement, and more stable water chemistry than fish-only marine ...