Zebra Danios Odd Behaviour

[fish124]

Hi i have just started up a tropical aquarium, in the 1st few days i had 3 zebra danios alone. Yesterday I added 5 black neon tetras. Since then I have found that one of the zebra danios is acting erratically, chasing and knocking the other zebra danios. And a development in the last few hours is that all the zebra danios are starting to behave like this and are chasing and knocking the black neon tetras too. Should I be concerned?

30 litre tropical biOrb
3 x zebra danios
5 x black neon tetras

 

[The-Wolf]

too many fish to early, not enough danios for a school and the wrong type of enviroment for them.

My advise;
take the danios back
research about cycling a tank.

 

[fish124]

How many danios make a school? Should I remove the danios or should I remove the tetras?

30 litre tropical biOrb
3 x zebra danios
5 x black neon tetras
[/quote]

 

[The-Wolf]

My advise;
take the danios back
research about cycling a tank.

absolute min group is 5 danios.
they need far more horizontal room than a bi-orb can provide