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The acidity for tropical fish? I think your referring to the acidity of the water in their aquarium...???

Generally, "tropical fish" do well with a neutral (7.0) or slightly acidic (6.7-6.9) PH level in the water of the tank. This is easy to test using a PH test kit from your pet store.

The acidity of the water is affected by whatever is IN the water with the fish---in the wild, the flora and fauna of the area dictates the PH (acid-neutral-alkaline) of the water. In general most of the common tropical fish (freshwater) sold in pet stores come originally from central/south America and Asia. The waters in these areas are slightly to mid level acidic depending on the time of year. These fish would be the common "community" tropical fish like tetras, gourami's, live bearers (guppies, mollies etc) and algae eaters/scavengers. The larger "cichlids" like Oscars, Jack Dempsy's etc are also from South America but are aggressive.

All do fine with an PH (acidity of 6.8-7.0) as most are commercially raised now anyway.

Don't put "wild" rocks in your tank as they could contain pollutants and be very calcium rich (like sea shells) and raise the PH to above 7.0 into the Alkaline level.

Some fish (like the African Cichlids) prefer a high alkaline environment...

Hope this helped,

Jason

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16y ago

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