I was going to say it was the kind of Polygonum that Tropica carries, but then I checked their web site, and they don't carry it any longer. The kind they used to have developed reddish new growth in good light. As I recall, they didn't know what species it was.
I've got 2 similar polygonums. I can't say which one yours are, the leaf shape/length look very different from what I have. Here are the pics for comparison.
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