Cardinal tetra strange behaviour

The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.

Stonaar

Aquarium Advice Newbie
Joined
Jan 11, 2021
Messages
2
Hello everybody,

Today I went and got 8 cardinal tetra's for our aquarium.
I see that 7 of them are healthy and normal but the 8th fish is behaving very strangely.
It does not swim with the other 7 fish, the way it swims is very strange it goes up to the surface often, stays hidden inside plants a lot of the time.
Im worried it might be sick.

I'm not yet very experienced at having an aquarium as this is our first tank.
It's a jewel 110 litres tank.
I've tested for nitrite and pH and both values are ok I think (nitrite 0.05mg/l and pH 7.0).

The tetras are together with 3 black mollys and 2 marble biota (I hope that's the correct name) and I don't see anybody harming the tetras.

I've uploaded a video of this specific fish here:
https://vimeo.com/509175397

Does anybody recognise this behaviour?
Should I be worried or will this correct itself?

Many many thanks in advance for your assistance!
 
Back
Top Bottom