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It is a species of Crypt. Could be Crypt parva. I had it at one time and then sold it. There may have viable runners remaining in the substrate and what seems like months later these appeared.
Be kind to your plants [emoji271]
They have at least want to try and live. It's amazing the different growth on the crypts based on where they are. The dwarf sag is sprouting everywhere. And the red stuff is happy too. The subwassertang is in Big Daddy and the corner of the Nursery along with the moss. I had one casualty with the fine red green leaf plant with algae but everything else is chugging along.