my frog fish has an air bubble in the stomach

[tubastrea1]

I've this beautiful antennarius maculatus since almost one year.
very healty and hungry, after he has eaten 3 small ghost shrimps almost 3 weeks ago, started to swell.
now he has a pretty big bubble in his stomach and stays always upsidedown, trying to get rid of it.
Someone have had a similar experience?
any suggestion how I can help him?
<a href="http://s493.photobucket.com/user/tubastrea_photo/media/pesci/pesce%20rana/Immagine002_zpsefd99bb4.jpg.html" target="_blank"><img src="http://i493.photobucket.com/albums/rr293/tubastrea_photo/pesci/pesce%20rana/Immagine002_zpsefd99bb4.jpg" border="0" alt=" photo Immagine002_zpsefd99bb4.jpg"/></a>

 

[roenicknewf]

Happen to mine before before ..You have to burp him..Just gently message the belly and work it out ..Obviously keep the fish under water

 

[tubastrea1]

Happen to mine before before ..You have to burp him..Just gently message the belly and work it out ..Obviously keep the fish under water

Roenicknewf,
I just tried but no success.
as soon as I caught him,he ingested water inflating his body for defence.
any more specific suggestion how to do it?
thanks.

 

[xrayjeeper83]

I know with puffers you grab them by the tail and shake them back and further under water