Neon tetra aggression

Rook100

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I have just added 6 unsexed neons to my 96 litre planted tank, (the tank was previously empty) 2-3 are showing lots of aggression, my plan is to add more over time perhaps this will help? Not sure if I’ve ended up with several males, will have to look into sexing them any thoughts?
Thanks
 
I would get the entire intended group ASAP. This is one reason why all shoaling species should always be introduced together at the same time. A group of no fewer than ten, preferably a few more (you have the space here). this is not a particularly aggressive species, but in smaller numbers they do have problems so adding them at the same time to a new tank environment is advisable.

It so happens that there is another thread on this very issue, adding more neons to an existing group of six, and some interactions. Hopefully things will work out in both cases, but the sooner you get the additional neons the better.
 
There are a lot of sites out there that tell people that a group of 6 is a sufficient school. But in the wild, these fish school in the hundreds or thousands. For micro fish, six isn't enough.
 
Scientific-based studies now exist that demonstrate that groups of ten are minimal for most shoaling species, but some need even more than this. The neon tetra was one species studied. Groups of ten were better adjusted and healthier long-term. By comparison, groups of five and three, maintained in identical conditions, showed marked aggression. They also had a latency to feed. I find this very instructive; when a fish is reluctant to feed you know there is something wrong.

"The effect of group size on the behaviour and welfare of four fish species commonly kept in home aquaria," available free online:
 
Thanks all for your replies, Added another 12 today things seemed to have calmed down the new additions have coloured up within the first hour.
 

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