Yep. This little friend can hitchhike in on something else. Some people like it, but the carnivorous Utriculara species have issues too. It's definately not a Riccia.
Can hurt shrimps or fish? I have 1 guppy (because the tank is cycling) and is fine
please more info of the plant. It is similar to riccia in that the two floats and not have root (i think). I has utricularia graminifolia and have similar plant parts.
It captures and digests small things, on the order of size of a Daphnia or an ostracod. It is a weedy plant that gets entangled in your other plants and is hard to get rid of.
When I had this invader it was entangled in some moss to the extent that I had to discard all of the moss I had. It felt like it was made of something like hard nylon, tough enough to make ropes with it. Get rid of it and hope you get it all.
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