Probably just yawning. If he had a Respiratory infection he would be doing it alot. Some other signs of Respiratory Infection are:
-Wheezing, popping, or gurgling sound when breathing.
-Frequent face rubbing on the tank or furnishings
-Mucus or bubbles in the mouth or nostrils.
-Dried mucus around the tank from face rubbing.
-Constantly laying with the head elevated.
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