That’s a mantis shrimp.
Well, not a shrimp, just probably vaguely looked like one to whoever decided to call those things “shrimp”. Taxonomically it's its own thing. Also known as stomatopod, if we’re into labels.
And those things punch. The glass on that fish tank is bulletproof, actually. A single specimen can deliver a punch with the acceleration up to 51 mph, which moves so fast it creates a pocket of air that creates an immense amount of heat when it inevitably pops less than a second after.
The US navy employed a similar effect to their advantage in World War 2 where they positioned submarines inside colonies of pistol shrimp, so those could serve as an acoustic cover, because that much force ends up disrupting sonars.
Those things are so-o-o built for close range combat to the point of you being jealous. You wish water boiled around you punching someone, but it’s out of the question cause you’re kind of stuck with those weird meat sticks for life.
You are convinced that thing has a telepathic connection to you. You tried teaching it to attack on command and it even yielded positive results, for some reason. Probably because it attacks everything on sight.
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