I am one of those people who's favorite fish is a Cow. Talk about personality !!!
They do have the ability to change color and spottage like chamelians, so whoever asked about theirs chaning color thats normal. They are shy, but with some fairly
regular human interaction become very sociable. I have even had mine swim through my thumb and finger as a circle !!
NOW FOR THE BAD NEWS
Right before Christmas, I was upstairs with the cat watching TV, it got late and as i picked up the cat asleep in my arms and walked down the flight of steps, my sock feet lost their grip and i fell down 7 steps tossing the cat out of my way so i wouldnt fall on her and harm her. Needless to say i broke a couple ribs and was in pain for several weeks.
It was not until the next morning when i got up and out of bed, and did my morning ritual of checking on my tank family, did i realize that 100% of the tank WAS DEAD !!!
Every single fish was dead, 11 fish in all. My abrubt fall, hitting the floor apparently startled my cow so bad, that the toxic gland was released, and all my fish were dead.
I love the species, and i recommend every one try one, just always be mindful that things like this can happen. We are VERY fortunate that our salt water store has always treated us very well, and felt so bad for my faul and injury that they replaced all the fish we lost free of charge...... except for a cow fish. Im just not ready to do that unless he is in a smaller tank of his own.