The examples beneath are for small freshwater fish; larger freshwater fishes and most marine fishes need rather more generous allowances. Some aquarists modify water’s alkalinity, hardness, or dissolved content of organics and gases, earlier than including it to their aquaria. This can be accomplished by additives, similar to sodium bicarbonate, to lift pH. Some aquarists filter or purify their water through deionization or reverse osmosis previous to using it. In distinction, public aquaria with massive water needs often locate themselves close to a pure water supply to reduce back the level of treatment.
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