whats the most brutal mean fish ever?

[Veneer]

Freshwater Shrimp

Those of you who know freshwater shrimp only as feeders or passive algae-eaters may believe me to be joking. As the images evince, I'm not.

Macrobrachium rosenbergii- "Giant River Prawn" - young adult specimens:

See http://www.aqua-addiction.com/forums/index.php?act=Attach&type=post&id=24468.

Look http://southcenters.osu.edu/aqua/intro/sld013.htm as well for a full-grown specimen.

The following statements attest to the basis of the species' appeal in a character for which it is reviled by others:

there[sic] nasty shrimp..they eat my small african cichlids...also shrimp pellets half there[sic] size!

i was the proud owner of "Louie" i had to give him to a friend of mine because he more than outgrew my 30 gallon tank. i would recommend keeping it alone. unless you want it to kill everything. i had a 10" florida gar in the tank momentarily until i got my 55 gallon setup. it was for a very short time. two days later the gar was lobster food. he also ate a pleco, two snails, and my rafael cat. his normal diet was feeders and he loved shrimp pellets. Louie was definitely an awsome shrimp though. i gave him to my buddy to put in his 75g, and on my birthday Louie died . he was about 14" of body and about 8" of claw, by far the coolest aquatic pet that i have ever owned.

I have a blue prawn and
can verify it will catch and eat anything it gets it claws onto. The
LFS failed to warn me about this and I foolishly did the "there's only
one, I should grab it before it's gone" kneejerk purchase. It ate nine
tiger barbs, a whiptail catfish, a skunk, a beta[sic] and even a 6" bala
shark. Did I mention this loss was all in about the first three weeks!

They're extremely agressive and complete hogs. I drop in three algae
wapers [sic] and he'll find all three and attempt to eat them similtaniously,
even bullying the Pleco to give up the one it's working on. Now Mr.
Snappy is my population control tool for my pair of Convict Cichlids,
added after massive fish losses when I opted to go with agressive
species. The convicts, pleco, skunk and remaining balas all know to
steer clear of him. Convicts seem rather peaceful in comparison. I would
NEVER get another prawn should I loose[sic] Mr. Snappy.