Ok, I was just watching my puffer fish swim around and act goofy when all of the sudden his right side fin(dont know the correct terminology) was sucked into his gill slit or gills or whatever it is. I just thought it was something they did until I noticed him struggling to push it out. It went on for about a minute and I was panicking trying to think of a way to dislodge it until he finally forced it out. This cant be normal can it? What can I possibly do if I see it happen again and he is unable to force it back out...This is by far the weirdest thing I have seen in my tank yet, it was kind of like watching a dogface suicide attempt.