I was really expecting them to be hard to keep. The guy at the fish store told me that they needed very high light levels - 4wpg+, and anything lower would make them get very tall, and not many leaves.
I decided to get 2 anyway, and am sooo happy. Mine are this deep rich red, with a few long skinny leaves from before I upped my lights. They are really starting to take off, and I bet I have a good 9 or 10 leaves on the bottom now.
I have 2.6wpg, and laterite on the bottom. I've got co2, but not as much as I should.
From what he told me, and he could be wrong for all I know, if you have lower lighting, the leaves will grow long and tall... almost near the surface like lilly pads.