btas with bulging mouth?!?!?!

Monster00101

New member
I just bought a rock off a lady that had three btas on it. It was about a half hour ago and while acclimating i noticed that all three of them have a bulge next to there mouths. Is this normal? I have only put one cup of my tank water in and my tank is testing fine. It is -21c here right now but they were only exposed to the air for 2 min or so. they where in a large bag of water when there were exposed so i cant see it being that. Any help would b great i only paid $15 for the rock and nems but would like them to do alright.
 
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