black widow tetras are aggressive?

[rabbit]

ok, if a small school of Black widow tetras in a 20gal planted aquarium. Everything Ive read online says that they are relatively peacefull schooling fish. But mine seem to be displaying particularly aggressive behaviour. They charge each other and "flash" (that is, they sort of sideswipe each other right before contact).
Can anyone tell me if this is normal behaviour? There are 8 tetras total.
The other inhabitants in the tank are 4 small algae eaters and 1 male and 3 female dwarf gourami.

 

[madasafish]

A post on this link: http://www.aquariumfish.com/anforum/topic.asp?TOPIC_ID=9814 says that the black widows are "terrible fin nippers" (Quagaar's post, half way down).

Perhaps they're particularly aggressive tetras!?...

 

[HOLLIEO]

I have 4 Black Widow Tetras and they are wonderful fish! Well, that is until it is time to eat. I have noticed when they are charging for the top of the water to eat the flakes, they kinda just nip at everything. But as far as aggresive, I think if you just keep em' feed well, they should be fine. I have mine in with about 14 molly fry and everybody has been doing great now for about 3 weeks.
Good luck, maybe the fish are just a little moody right now

 

[Terry]

You might just have a mixture of male and female Black widows and they are displaying to each other.