Mine is a floating species, potomageton natans. You may have a different kind if it grows only submersed.rainbuilder, what is the growing habit of yours? I cleaned off a little and put it in a twenty with decent lighting no co2 for the heck of it to see what happened. Wondering if it's gonna be all leggy or if it will thicken up.
Only one species in not native to Ca and the USA: P. crispus. They are wide spread and nearly 80 "species" and hybrids.i do have it growing in one of my tanks. VERY invasive! likes to send long runners around the tank. best for a low light tank me thinks