"A long time ago, I would populate my little bullshit fish tank with aggressive fish, such as cichlids, oscars, convicts, or any fish that was demented.
So, after stuffing my 10 gallon tank with as many fish possible, one little fucker made his mark. He made his “mark” by biting off the heads of the other fish, much to my wife’s dismay. "
The author, "The Fly" (on Wall St) has a financial blog ibankcoin.com. Occasionally he writes some short stories.
This is one of those funny short stories
http://ibankcoin.com/flyblog/2007/11/10/25/#sthash.wyb5BFYG.dpbss
It is listed under The Important Matter of category on the site.