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post #15 of (permalink) Old 11-07-2019, 06:42 PM
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There are some more specialized species of fish that require seasonal temperature fluctuations in order to remain healthy in the aquarium ( as they do in the wild). One species that comes to mind is Gymnogeophagus. This species must have the temperature lowered for 2-3 months out of the year to replicate the environment in their natural range—primarily Uruguay, where in winter the temperature can drop to just a few degrees above zero. If the temperature is not lowered as required these fish succumb to typical cichlid illnesses- like Hexamita and HLLE.

So, yes, there are examples of fish that live among these sub-tropical areas that are kept by aquarists who can match their needs.

Here is a short write-up on this species:

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