White spot assassin bugs, and they hunt by stabbing prey with a rostrum and injecting enzymes that liquefy it, which is exactly as unpleasant to watch as it sounds.
They can also spray that saliva defensively toward a threat, and it is genuinely damaging to eyes. That, plus a bite that keepers describe as far worse than most stings in the hobby, makes them a hands-off animal despite being an insect.
Easy to culture, prolific, and affordable. Colonies produce continuously with minimal input. The only real variable is how many US vendors are currently willing to ship them, which fluctuates.
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# PART 2: SPECIES BLURBS