DO NOT underestimate your slow, unassuming pet. Goldfish have sharp memories, often remembering the person that feeds them. Unlike the archetypal saying that goldfish only have a three second memory, their minds can in fact recognise a person after a three-month separation.
Also, all varieties of goldfish can see beyond the violet; that is to say they can see ultra violet and infrared lights. They can even see sparks from static electricity which people cannot. So be careful dragging your socks on the carpet before holding your goldfish aquarium or your pet fish might see sparks flying.
Photo caption – THREE SECOND MEMORY: Goldfish actually have complex minds