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For care info, Caudata Culture is the site for you. Axolotls? The Axolotl Site is the best on the net.
www.unusualpetsguide.com
If he hasn't been doing this before, then it could be possible you have a sick axolotl. Open mouth is consistent with bacterial infection. But sometimes, they are just silly like that.
It can also be a stress indicator too. Check your water parameters, especially your temperature.
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Axolotl Open Mouth or Yawning? What Is Gaping and When To Worry? - Unusual Pets Guide
Normally, axolotl open mouth behavior is triggered by stress and discomfort from impaction, improper nutrition, or poor water conditions.www.unusualpetsguide.com
I noticed some months ago... The temperare its ok. 17 degres Celsius