what kind of fish is this -it kinda ate every fish in the tank?

ok my mom got this so called tetra an it ate every fish in the tank ..guppies ,mollies an even a medium size gold fish!

just plz tell me what it is :

http://s935.photobucket.com/albums/ad193/swsteven14/?action=view&current=fish2.jpg#!oZZ2QQcurrentZZhttp%3A%2F%2Fs935.photobucket.com%2Falbums%2Fad193%2Fswsteven14%2F%3Faction%3Dview%26current%3Dfish1.jpg%26

http://s935.photobucket.com/albums/ad193/swsteven14/?action=view&current=fish2.jpg#!oZZ1QQcurrentZZhttp%3A%2F%2Fs935.photobucket.com%2Falbums%2Fad193%2Fswsteven14%2F%3Faction%3Dview%26current%3Dfish2.jpg%26
 
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