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common name is bladderwort.

It's a carnivorous plant (also the fastest plant, I believe...)

If it has little bubble-looking things, those are the traps - some microscopic critter swims near by, triggers the trap, it opens, and sucks in the critter.

Lots of people get annoyed by having UG in their tank, it can be kinda weedy.

If you remove it, stick it in a bowl and set it on a windowsill, and you may get flowers eventually. :)
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