Pound for Pound toughest fish?

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i have 3 convicts and all a relatively peaceful, can be fin nippers at times but they are usually ok. I have 4 Green terror cichlids that will try to take your finger off if you put it in the water.
 
oh yeah had some green terrors and the only way to keep it from killing everything else in the tank was to add an oscar that could kick it's a@# not every oscar was succesful but had one but that guy eventually died then the green terror tore appart the red jewel's that i gave away to a friend that he gave me back cause they were to mean then muched threw the convict's and the other oscar's killed the smaller green terror i eventually put him in a goldfish bowl by himself cause i had a ton of stock and nowhere to put em and was eventually able to give em away.
 
o yeah that green terror killed a red terror and those convicts were all bigger and an entire fry same with the red jewels.

when i bought the fish it bit the clerk in the lfs and was hiding in the filter.
 
mangrove jacks are pretty vicous, i have witnessed a jack tare a convit in two with a single bit, and a mate of mine feeds red devils to his jack as feeders.. i would say mangrove jack would be the toughest, no matter what the size. sooty grunters are also a very aggresive fish, they would own a red devil, black belt, green terror. but the over all champ i recon it'd have to be the mangrove jack
 
With all things considered, pound for pound it's gotta be the Fahaka Puffer. I've own snakeheads, wolfish, gars, triggers, chichlids of all sorts and after observing all these fish, there is absolutely nothing more fearless then a Fahaka. Fahakas have a bone crushing bite, they are the most creative swimmers and are absolutely relentless. A Fahaka can attack from many different angles and is not limited to head on conflict. As a fail safe the Fahaka tastes terrible to those who bite it and has the added advantage of puffing out if in serious trouble. Fahaka hands down guys.
 
I think the same size Dovii would pound the snot out of a snakehead or wolffish. They also have a mean set of dentures. But what do I know I am an egg here.
 
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