Can Swimbladder Be Caused Across Multiple Fish?

[juggernuts]

The other day I performed about a 40% water change and added the usual amount of tetra prime to the water.

Ever since it appears that one of my colombian tetra's and a single denisoni barb appear to be swimming ok but from time to time looking as if they are struggling to swim properly. They both appear fit and healthy and are still eating but could it be possible some change in the water has caused their swim bladders to start to become unstable? all other fish in the tank are perfectly fine

thanks
Paul

 

[fluttermoth]

It's a possibility, but unlilkey. It would probably affect them all if it was a water quality issue.

I'd do another large water change, not feed for two or three days, then feed with a few peas and see how everything looks then.