That's too bad. My fish will push each other out of the way to be petted. My cat used to get jealous when we paid attention to the fish and not to her. She would cry piteously. We told her that she was our "pacu kitten" My husband will pick up the cat and with a rocking motion say "Pacu kitten goes swim swim swim. Pacu kitten goes swim swim swim" as he walks back and forth in front of the tank. The pacus follow along, forming a parade inside to match the parade outside the tank. It's the cutest thing ever.
I just love our interactive fish.