A couple days ago I picked up my new baby porcupine puffer. He's the last member of a new FOWLR tank I switched over from brackish. I few fish made the switch as well including a pair of Columbian Shark catfish and a FIgure 8. They really seem happy now in the full salt. Other tank mates include a Cowfish, Blue Spot puffer.
So, I bring the porcupine home and start to acclimatize him to the tank. All the puffer were interested in him. When I eventually let him go in the tank he had a bit of a panic attack and kept swimming back and forth across the front of the tank very fast. He started to get tired and he sat down in the front right corner of the tank. One of the sharks, who had never shown any sign of a personality before, seemed quite curious and kept coming over to check out the puffer. The puffer didn't mind and the shark caressed the puffer with her whiskers and all of a sudden the puffer calmed down.
After that the two hung out together with the shark swimming under the puffer, rubbing his belly and puff swimming over the shark petting her back. They are best friends now and even sleep together. I'm happy puffer made friends so quickly, but it is a really bizarre pair.

There is another bigger shark who keeps telling puffer friend shark to get away from him, but she always goes back to him.