Category: Fish
This native of the Congo River Basin of Africa is commonly kept in aquaria and requires soft, peat-filtered water and a darker substrate. They are happiest at lower light levels and their beautiful rainbow colors are most obvious in subdued lighting. They are a peaceful, schooling fish that are easily intimidated by aggressive tank mates.
https://en.wikipedia.org/wiki/Congo_tetra
http://www.petsource.org/aquatic-by-species/aquatic-fresh-water/3712-congo-tetra.html
ABC. It’s easy as Protandry
The largest, most aggressive female anemonefish rules the roost - she is the dominant member of the social group, and with one breeding male, the only one who reproduces. In anemonefish society, everybody knows where they stand in the hierarchy! So when she leaves the group, everybody moves up one spot - including the largest, most aggressive male, who undergoes a sex change to become the leader (and breeding female) of the group. While undergoing a sex change might sound drastic to humans, it is actually not all that uncommon in other species. Many do it, either naturally or due to environmental factors: fish, invertebrates, amphibians, some reptiles, even the occasional chicken!
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