I have a 5" Porcupine Puffer, this morning he was swimming just fine! I seen him about a hr later & he was swimming backwards & at the top & lining to one side a little! I grabbed him to see if he needed to be burped since I did see him some what inflated......but that doesn't seem to be the problem...he was a little Stress from the other night my 4' black spotted a moray eel talking his night time stroll around his tank! The Puffer stopped reacting to the eel since he realized he was not after him! .so could it be the stress or something else? I hope he makes it ??
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