Egeria najas has really beautiful deep green color, lovely leaf pattern, particularly on the tips. The leaves curl down, some specimens more than others. The narrow leaves are edged with small "teeth." The stems curl downward at night like a fiddlehead fern. There are about 5 leaves per whorl. Each stem is smaller than those of Egeria densa.
It can remove carbonate ions from the water as a carbon source. (calcuim collects on the leaves without additional CO2, as in the picture) It quickly re-grows side-shoots and the top can be easily replanted as well. Egeria najas is a fast growing, easy stem plant , but each stem won't grow more than 2 or 3 shoots at a time. It can grow in as little as 1.4 watts per gallon...(possibly less) It can grow in a pickle jar on the windowsill, with nothing more than a bit of sand and a culture of daphnia. Basically really easy. If it is missing some sort of mineral, the newest leaves become quite small.