can anyone tell me about serpae tetras?

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aquabeast said:
are they like only mean when in low numbers?

Normally when an otherwise peaceful schooling fish is becoming aggressive, the issue is in the numbers. Six is generally the recommended minimum for a school.

Courtesy of Dakota's iPod.
 
I would agree with that. I wasn't saying they ARE mean, just that every now and then there will be a slightly aggressive group of them. I would expect them to get along in most community tanks.
 
I have a pretty rough group of them too. Constantly moving but I wish I had a 20 Gal. long tank that they could have for themselves. I have 6 and they are a trip.
 
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