As you've read, this is a high-light plant so make sure it gets plenty. As with most high light plants, this one likes soft, acidic water and plenty of iron to maintain its red pigmentation.
The class of molecules that control the red coloration in plants are the anthocyanins. One of the things that changes the color on anthocyanins is the level of acid or alkali (i.e., pH) around the molecule. The anthocyanin turns bright pink in acids, reddish-purple in neutral solutions and green in alkaline or basic solutions.
The only image I've been able to find of this plant shows it in a basic environment showing little red pigmentation. See below. I'd be very interested to see a pic of yours if it has a good red color.
Nesaea sp from Oriental Aquariums is not the same as Nesaea crassicaulis. The Nesaea sp from OA is also known as Nesaea sp 'Red Leaved' or Nesaea sp 'Rotblatring' (spelling?). It is insidiously difficult to grow in my experience. It needs perfect, stable nutrient conditions and a nutritious substrate to thrive. It tends to be slow growing.
Nesaea crassicaulis is also difficult to grow, but the leaf size and shape is more similar to the more common and more beautiful Nesaea pedicellata.
However, Nesaea crassicaulis has salmon pink leaves which make it look more like Ammania gracilis than the other two.