I have seen quite a few "why is my ray climbing the walls of my tank?" threads, and I would like to shed some light on the answer to this "riddle".
Perhaps it has something to do with the fact that you have taken a living being, from the endless rivers of the amazon, and placed it in a TINY glass box (that you seem to think is "ample space" for them to "thrive") with little to no mental stimulation, that you expect them to be infinitely enthused with.
News flash. These are intelligent beings, with brains, JUST LIKE YOU.
Do you honestly think a glass box with a few pieces of rock and wood is going to keep them happy for their entire lives, let alone 15 minutes?