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  2. Marine aquarium - Wikipedia

    en.wikipedia.org/wiki/Marine_aquarium

    Ammonia and nitrite should be tested regularly; any detectable levels (i.e., over 0 ppm) can be indicative of a problem. Nitrates should not exceed 2 ppm in reef tanks, or 20 ppm in fish-only tanks. It is sometimes acceptable to have a small amount of nitrate buildup, as some livestock, especially fish, are fairly tolerant of nitrate.

  3. Aquarium filter - Wikipedia

    en.wikipedia.org/wiki/Aquarium_filter

    In the artificial environment of the aquarium, the nitrogen cycle effectively ends with the production of nitrates. In order that the nitrate level does not build up to a harmful level regular partial water changes are required to remove the nitrates and introduce new, uncontaminated water. [8]

  4. Recirculating aquaculture system - Wikipedia

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

    High levels of nitrite are also indicative of biofilter impending failure. Nitrate is the end-product of nitrification, and is the least toxic of the nitrogen compounds, with 96-hour exposure LC 50 values in freshwater in excess of 1,000 mg/L. [ 6 ]

  5. Maximum acceptable toxicant concentration - Wikipedia

    en.wikipedia.org/wiki/Maximum_Acceptable...

    The maximum acceptable toxicant concentration (MATC) is a value that is calculated through aquatic toxicity tests to help set water quality regulations for the protection of aquatic life. Using the results of a partial life-cycle chronic toxicity test, the MATC is reported as the geometric mean between the No Observed Effect Concentration ...

  6. Total dissolved solids - Wikipedia

    en.wikipedia.org/wiki/Total_dissolved_solids

    Bottled mineral water usually contains higher TDS levels than tap water. Total dissolved solids (TDS) is a measure of the dissolved combined content of all inorganic and organic substances present in a liquid in molecular, ionized, or micro-granular (colloidal sol) suspended form. TDS are often measured in parts per million (ppm).

  7. 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.

  8. Water containing high levels of fluoride could hurt your IQ - AOL

    www.aol.com/article/2014/08/25/water-containing...

    Some scary news for those in the Northeast -- the water you're drinking might be hurting your health. New data shows several communities in Maine and other New England states are drinking and ...

  9. Community aquarium - Wikipedia

    en.wikipedia.org/wiki/Community_aquarium

    It is important to test for ammonia, since it is a chemical precursor of nitrites and nitrates, also harmful to fish. Ammonia is removed from the water through the nitrogen cycle, which takes place within the aquarium filter, which takes a few weeks to start processing the ammonia. The processed ammonia is converted to nitrite, which is then ...

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