the fish dead long ago threw away already......if i found the dead fish maybe left bones only  ok this is why i said it was getting whacked. i have a group of guppy. all of their tail fins are different and easy to tell apart. one particular guppy was chased all the time by the others.............few days later it ended belly up and the tails was in shreds........ then another one kena.........maybe i accidentally bought x-guppy...........vicious type one

HI 

1 of my newly bought male guppy just died of all sudden. It has been in my established tank for a week. Others are doing just fine without any signs of tension or disease. So, i`m all out of ideas of the cause of death. Is it becoz it died of old age? How can anyone know how old their guppies are? any methods?