Gerry,
I just mail ordered some P. Stellata and should receive it on Friday, unless they short ship me.

I'll let you know how it does for me.
I've been playing with R. Wallichii. It grows like a weed for a while and gets near the top of my 21" high tank. However, once the base of it starts getting shaded, algae grows on the lower leaves. The algae just turns the leaves blackish; it doesn't really grow out anywhere. I'm at 30ppm CO2 and using EI with pretty high light, so I'm not sure what else to do with it. I can cut the tops off and start over, of course. I'm hoping P. Stellata will be a little easier to work with for me.