Weather Loach Has A Trapped Air Bubble

[sallyt1907]

My usually healthy, active weather loach has developed a rather large air bubble inside him. At the moment he is just letting himself float bottom up at the top of the tank but everytime I think he is dead he swims away in his normal frantic manner. He's fairly small (about 3-4 inches) and it seems he just finds it easier not to try to resist the bubbles bouyancy. We've had him about 6 months and have never had any problems with him.
Any ideas on what I can do to help him? He seems so uncomfortable
Thanks

 

[hensonc4098]

It might be a problem with his swim bladder, although i'm not the best at diagnosing things lol.