Ya should know two Golden Rules about keeping semi-aggressive/aggressive-omnivores/carnivores...
"If Fish A can fit in Fish B's mouth, it will likely end up there at some point."
"If it's capable of a bad attitude, sooner or later it will wake up on the wrong side of the tank and woe to the fish in it's way."
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Mr J. Aro must've woken up on the wrong side of the tank
Lucky he didn't get his punkass hit by the Ray.