mixing silver dollars

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I have an altidorsalis, maculatus, and a hypsauchen all together, they all get along.
 
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Among Metynnis, they mostly all get along and become groups. However, depending of ratio of males/females in a particular group, the 5-6 fish can be very peaceful and harmonious, but also very rambunctious; regardless of species. Easiest is when more females in the group. In addition, too small a tank is usually the limiting factor. What size is your tank?
Footprint is most important - No less than 4 feet tank, better 6 or more.
 
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This is a group of eight adult Metynnis, 3 species:
2 male, 1 female M. maculatus
2 male, 2 female M. lippincotianus
1 male, M. altidorsalis

IMG_0378 Crop.jpg
 
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