General question about corys

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If you have 1 of a few different species i found they will oftens chool together... but if you have 2 or more they will break off into "groups"... i never saw aggression issues reguarding mixing them.. but imo its probablly healthier to keep a few of the same species.. or at least a group of 3 of multiple species... less stressful overall on the fish imo. But thats just from watching them at work and the few species I've kept at home.
 
Cory's will usually "pal around" in shoals regardless of breed
 
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