Struggling Fish - What's wrong with it?

[Eyeless Potato]

Greetings.

I have a silvertip tetra that is struggling.  It has been in a 10g quarantine tank for about two weeks since I bought it (in a batch of 20) from my LFS.  Got the med trio for a week and now it is about another week later.

All the fish look good up to this one today.  It's mostly on the bottom, struggling to swim (see video).

Checked water parameters, everything where it should be. (Amon, Nitrite, Clorine = 0, Nitrates = minimal, ph = 7.5ish, Temp is at 77-F).

Any advice on what happened to this individual and whether I need to worry about the rest is appreciated.

 

Video link:

 

Edited November 9, 2020 by Eyeless Potato

[Cory]

Something is wrong with it's nervous system, typically doesn't spread. 

[FriendlyLoach]

Fish TB can cause this.

 

[Eyeless Potato]

@CoryThanks for the info.  So is it like a genetics thing?

[Justin Campbell]

I’ve seen new fish do this too, which I assumed was due to a heart attack or other stress.

[Cardeater]

I always assumed it was a swim bladder disorder when fish swam erratically but it's interesting to hear that it's nervous system problems that can be the cause.