Hi There,
Thanks for your reply.
The puffer is in a 4ft tank with around 30 fish including tetras, clown loaches and Kribensis.
After reading about swim bladder it does seem that this could be a possibility as he usually sinks to the bottom if he tries to swim.
The site mentioned...
Hi There,
I don't know if anyone can help but we have a 3 and a half year old mbu puffer fish that has always been healthy abd fine until a few weeks ago when he seems to have started having problems with his back. He no longer seems to be able to swim, when he tries to swim upwards he falls...