Pound for Pound toughest fish?

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I'd have to say Fahaka puffers, not only because I currently have one.. I've never had a snakehead but they seem vicious on Youtube videos. My old fahaka grew up to 12" , but max size is supposedly 17" or so. When I had my old fahaka & I was trying to experiement by adding tankmates hoping that they can co-exist... But nothing was able to live with him. Tried a 10" FLowerhorn that was mean as well, but the fahaka bit his lower jaw off & ended his life. Im not sure how a Fahaka would fend off w/ a SH, but that would be the ultimate match imo.
 
im now thinking FLOWERHORN
 
may have been said allready but pound for pound the most vicious predator in the aquatic world would have to be the Mantis shrimp.
 
All these posts on fish like the jaguar cichlid and oscars. Shrimp? Come on man. It absolutely has to be the hoplias aimara. Ive owned snakeheads for years and never seen a more aggresive fish than the Goliath Wolf Fish (hoplias aimara). Not to say the channa micros arent aggresive my 20 inch has eaten clown and royal knife fish 11-17inches,and massive 2 pound oscars a 12 inch gar pike. if he cant get them down he just rips em in half. Hard to find something that would be his tank mate.
 
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