Some good points here "If its hungry it will eat" LOL This is true .
"Piranha can go a months with out eating" This is very true I have a
cariba that has only ate two exo and a chicken leg since JULY 18 2007
I continue to feed my others only pellets till the Cariba breaks and eats .
I say start slow starvation , Being its a single specimen you don't have to
worry about canibalizum .