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Carpe Diem
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7,563 Posts
I have all three (habrosus, hastatus, and pigmeus)
Habrosus get just slightly longer then the other two, but about 2x the thickness. Habrosus also have 'blunt' noses, while the other 2 have more pointy ones. I feel that habrosus are more outgoing then others, but that might be because they are in the largest group (15).

If you want either one to school and be in the open, a decent sized group (10++) is basically a must.
 

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Carpe Diem
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7,563 Posts
Everyone says that pygmaesus is really shy even with large numbers. I did get 3 hasbrosus to start and they are very outgoing so far. I really enjoy them and hope to get more.

Does anyone keep all 3 species together? I wonder if hasbrosus would make pygmaesus more outgoing or do they school separately?
I had all 3 together for a while (now in diff tanks). Hastatus and pigmeus school together, never saw habrosus 'school' with others but they do co-exist just fine.
 
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