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I have two puffers and have noticed them puffing up lately. nothing new has happened . maybe they have been doing this all along and I just now noticed them.
Normally puffing is a result of being stressed. Its used as a defensive posture. You say puffers but I only see one listed in your signature. Has your stock list changed? Is there anyone in the tank picking on the puffers? What type of puffers do you have?