pennywort is a amazing plant , it can float or you can stick one bottom leaf down in the substrate and it will take off towards yoru lighting , it is a plant I would suggest for low light, but It also does well in high lighting HTH ~~
all my plants are low light only have 1 tank that has 2 wpg, the rest are lower lights,..
they can go higher but don't need to,.. i have easy care plants i use no ferts, or O2, just water and fish,..