Hmmm....
To me it looks like some sort of Rotala sp. Not sure which. Looks like its healthy though. Make sure you can replicate the growing conditions or it may change shape/color.
Good luck.
It does resemble that for sure..then it should be safe for the vivs I would think.
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I don't see why not!
I'd go for it.
Looks can be deceiving as cultural influences play a major part in the overall shape and confirmation of many plants. Plants that are grown with less food and higher light are sometimes different colors or more compact vs. those that are grown with plenty of food (fertilizer) and given low light.
When you get the plant, please post your own picture of it. Maybe it will help. I didn't think sphagnum could grow submersed in constant water like that which led to my thought that it might be an aquatic plant. I have seen Rotala rotundifolia look like that many times if grown in super strong light.