Yup, I've got that in my tank. Def. Alt. Reineckii, common name it was sold to me under was "Scarlet Temple".
I had it in my midground but had to move it back; it takes a while to take off (a couple of months w/ high light and CO2 to build a root system) but once it does, it shoots straight up to the top of the tank. Then it will grow smaller plants off of the base of the taller ones that you can clip off and re-plant. It doesn't send off runners though, so if you don't clip the new plants, they will stay in one spot and the bunch just gets fuller looking.
Interestingly, it was the first plant to get get GSA when my tank was breaking in, and it was the first plant to get hit with BBA when my tank started to go south due to a broken CO2 reactor, so you can probably use it to gauge the health of your tank, it seems to be pretty susceptible to algae growth. It also will show signs of stress before other plants (at least any of my others) like holes in the leaves or fading/melting.