Most Aggressive Fish you ever owned?

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Jag was the best and worst fish I have ever owned. Great at first but made me hate it later on...
 
jags are truly aggressive, but my jags are being bullied everyday by my largemouth. and if they do happen to fit in his mouth, they'd end up as a snack. they hide all day behind rocks where my LMB cant reach em.
 
I had a reddevil as a kid he had black teeth growing on his lips and he hated everyone and everything...he tryed to ram the glass if u just walked near him lol that was back in the late 90s

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Scratch when I said TSN I just got a caribe piranha and it's scary aggressive
 
When I put my then 2'' now 3'' Fahaka puffer into my big tank, the first thing he did was harass a pleco 4x his size to death. He couldn't even really get through its armor, so he'd grab onto it with his beak and tug on it till the thing eventually gave up and died.

Now he lives alone!
 
suprisingly, it was a male kenyi cichlid who was 3'' and killed my 6'' pike

Same, although mine had a hybrid son with a johanii and together they dominated, it was quite touching. The son was the only fish allowed out of hiding, everyone else was forced to coward, including his other children. Best part was the son was born pitch black (and purple during feeding time) with a mutation where he had no tail, his dorsal fin just continued down his backside, so watching the father protect him as he grew up was crazy. It was actually around when he decided to run the tank :-D :-D i know sounds crazy, but there was something special about him.
 
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