It is tempting to feed those colourful little creatures flapping about in the water, it may seem like the right thing to do, only it isn't. Many factors support the argument; firstly, by feeding them, you get them accustomed to having an easy feed thus making them a little lazy, they'd refuse to go on a food hunt, and in its stead, they'd wait for visitors to feed them. The other reason is that their digestive system is not formed in a way to break down human food – for instance, if you give them pieces of bread, they'd happily gulp it down, but it's not in their reservoir to digest bread which in effect would threaten their lifespan.