Puffy the puffer
A side note, when I had her in the 20 gallon, all she would do was go up and down the side of the tank....hour after hour. I felt she was bored. I moved her into the community tank...not really knowing how she would do with the other fish as I have tiger barbs, black neon tetras and swordtails in that tank.
She is not bored any more, she swims along with everyone else, sometimes she hides among the caves and plants and everyone keeps to themselves. No one bothers her or vice versa. And she does not swim up and down on the side wall any more.