at the lfs i work at, we have soem wild cough piranah's, they are red bellied per...... i dont remember the full name, and they are far from docile, or even shy. every other piranah int he store, black, red bellied (the regular type) and white, are about as entertaining as the pleco's we have. these fish are in one of the main displays, and have many people walk past them on a regular basis, and they NEVER hide, not even when the glass is tapped on. they actually react toward people like our larger oscors do. when ever we open the tank to throw in some food, they form a tight group, and DESTROY what ever we throw in, in an instant, if you blink, youve missed it. the only reason i am NOT talking my freind out of the piranah tank, is because we have these fish, and in a 70 - 100 gallon, they will be more than comfrotable, and if the decor is set up properley, they weill be out in the open schooling quite frequently. these are the only piranahs in the store that attack the food we give them in seconds. its rare that we see any of the oters eat. there are only 3 other fish in the store that are as impressive eaters, Nile Perch (probably my favourite, great hunter) and African Pike, and a Jardini. the oscors are just fancy bass!