I have a 75 gallons saltwater tank, and Doug the Porcupine Puffer fish is the silliest thing ever..I have owned him for almost 2 years..he has so much personality and is always hungry...he kinda reminds me of the Staypuff man from Ghost Buster's, and brings a smile to ever who sees him.
Like I said Doug acts more like a dog than a fish....and follows me from side to side of the tank...and then waiting and watching for me when I go off into that direction and stays in that spot until I return. Doug also enjoys watching TV....he is always looking outside from the tank, really not bothering with the other fish in the tank.