Congratulations on the new fishy, Lynnie - here's to hoping that this one enjoys a longer lifespan than the last.
I've never actually kept fish myself, so I've no idea how my own kitty cats would react to them. The closest I've come was owning one of those battery-operated "living aquariums", in which the little plastic fishies within are kept in constant motion due to vibrations in the water. It doubtlessly pales next to the genuine article, but at the time I thought that it was quite a neat little device. It held Cleo's attention on one occasion, but she never really looked its way much after that.