Haha I'm glad you're doing research on them. Since I'm the one that got you interested, I'll just tell you about the one I have right now. Since it's still small, about 12-14", it isn't very aggressive so it's housed with 3 Hydrolycus scomberoides. It actually gets beat up by them sometimes but at night, its a different story. I see it chase them and occasionally nip at them but nothing too serious. When it comes to feeders though, I will feed it first so that the payara's can get them but any that aren't eating, the aba goes around and will bite them in half, but won't eat them. One morning, I guess none of the scombs didn't feel like eatin, all the feeders were floating around dead, some were bit in half, others were torn to shreds, it was a straight up murder scene. Also, whenever I do a wc, it attacks the hose over and over again. It killed a common pleco that wandered into its hiding spot and it will sometimes attack my hand when I'm doing something in the tank. Luckily its small so it doesn't do much damage to my hand.
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