I have kept Red Tiger Lotus (Nymphaea lotus var zenkerii or rubra or even Nymphaea stellata, plants are sold under both names) on and off for the past 3 years. Based on habits I've observed, I think I may have actually had Nymphaea stellata, though the plant was advertised as Nymphaea lotus var zenkerii when purchased back in I think '05. I've kept it in a high-tech system in IL (3+ WPG, EI, and CO2) and in lower light systems (anything from 1.4-1.8WPG no CO2 or CO2, etc). It had been dying off gradually last year, and finally leaves no longer grew. I know that they often go dormant, but I didn't want to take the chance that the bulb would die (supposedly it can happen) and rot in the 36g, so I chucked it in a fountain tub outside, thinking if the bulb did die, it wouldn't harm any of my stock. Some months later, I'm cleaning out the pond and I see little red leaves growing from a tiny bulb. I moved it back to my 36g and it has now regained much of it's former size and strength. This plant seems impossible to kill and it actually survived a 2 day move from IL to Miami, FL. Probably a good investment for all but the lowest light levels. It can run rampant and dominate a scape. I don't personally recommend it for small tanks. My profile picture has a picture of my high-tech 15g with the lotus featured.
llj