A couple of months ago I planted a Nymphaea Lotus bulb in my tank. I was worried that it'd not survive as I'd cleaned the substrate pretty well. But it has sent up plenty of new leaves, so it seems healthy.
However, all the new leaves are on short stems and seem quite thin and fragile. I've not had anything that resembles the huge leaves on long thick stalks that I see in other planted tanks. I've not noticed any variants for sale, so think there is only one species.
I've bought some root tabs to improve the nutrients at the roots, but is there any point adding one if I'm not supplementing CO2?