Fish swimming at 45 degrees

[Catfish586]

hi I've just introduced some head and tail light tetras and have noticed that one of then swims strangely.... nose up, almost a 45 degree angle. The others are placid and happy to just hover/floatb but this little chap is always swimming, usually near the top of the water line. I've attached a pic. Any ideas what it is? (Could he have been injured during the transfer from the shop's aquarium to the bag, or poorly??) I'm at a loss. I didnt expect him to survive the night but he has done. Pic attached. You'll see the fish concerned because of the angle.

 

[Colin_T]

Can you post a video of the fish swimming?

If the fish sinks when it stops swimming then it has a swim bladder problem and should be returned or euthanised because they eventually burn out trying to swim constantly. There's no cure for swim bladder problems.

 

[Catfish586]

yes, here it is (little chap at the top). It doesn't seem to sink, although I've not seen him stop swimming...

 

[Colin_T]

put the video on youtube

 

[Catfish586]

put the video on youtube

done

 

[Colin_T]

take it back and get another fish or euthanise it