I have the same problem as yours, but my fish is a datonid 
Here is the link and got a pic too! A little blurry but you can see the bubble x.x
http://www.monsterfishkeepers.com/forums/showthread.php?p=2221041#post2221041
Here is the link and got a pic too! A little blurry but you can see the bubble x.x
http://www.monsterfishkeepers.com/forums/showthread.php?p=2221041#post2221041
