An unknown potted Cryptocoryne species that is easy to grow in my bare bottom tanks.  This was started from a replanted runner in my fishroom and now takes up at least 1/3 of the space in a 40 breeder tank.   No fertilizing, no CO2, no special soil, only LED shop lights above the tanks.  My water is very hard.   This plant is getting root bound.   You could keep it as is, or you could split it up and replant in multiple new pots.  Guaranteed to have snails.  Could have cory or Kali Tawa rainbowfish eggs, they really like laying them in these crypts.