I dont know about FW puffers but I know that SW puffers will occasionally fully inflate just to keep their skin streched and pliable in case they need to puff from fear or predatation. It is quite impressive when they inflate.
In SW I know it is really bad if they ingest air instead of water. That is why I always use a cup to transport them and never expose them to the air.
In SW I know it is really bad if they ingest air instead of water. That is why I always use a cup to transport them and never expose them to the air.