A 4" terra cotta pot that is pretty solid with an unknown Vallisneria species, probably spiralis.  It was started by replanting runners in my fishroom.  Use as-is or divide in two.  It's throwing runners from the container and leaves are spreading out on the surface of a 16" tall aquarium.  The rootball easily slides out of the pot for replanting or dividing into additional pots. This species grows FAST in my hard water under LED shop lights without any supplements, so it couldn't be much easier to grow. Nuisance snails are guaranteed to be included, Red Neon Blue Eye Rainbowfish (Pseudomugil luminatus) eggs are a possibility.