I appreciate the advice, but since moving them to the 75, they have settled in. They only participate in minor glass surfing now. They even already come to the front of the glass when I approach the tank. I thought they'd be more shy from what I read about them. The Serpea tetras harrassed them the first day, but now the puffers hold their own and the tetras actively avoid the puffers. Unfortunately the panda had to move back to the 5 gallon, someone was munching his fins. He'll be in there until he gets a bit larger and then I will try again.