Bubble on Neon Tetra

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SheppyFish

Aquarium Advice Newbie
Joined
Nov 20, 2011
Messages
7
Recently restarted my aquarist hobby after quite a gap (apart from the pond that is). I was quite successful when I was a lad but that was a long time ago and it's all much more scientific now so I think this community might be a help.

I'm going to start with a little Neon T problem. Translucent bubble around the mouth. Fish still ok. 3 affected. Any ideas?
 

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