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yeah it really doesnt looks aquatic, the leaves look kind of fussy, do they have little hairs. I have never heard of fuzzy aquatic plants before, so that is what makes me think it is terrestrial.
It's Aeschynomene fluitans, it's a floating plant, will grow quickly with high light. I had one in my 55 but I moved it to a bucket outside as it got too big. Apparently if kept in a pond it will flower.