There is a large different between the two species in their appearance, but is common for anyone who doesn't know (pet stores). If you could post a photo that would clear it up.
I've raised Chinese (Tenodara sinensis) nymphs before, and had
two ooths hatch on March 26. They recently
molted to L2 and had no issues with them. I provide them standard care as I do with any mantid species I've kept (11 species so far). The same goes for the 10 Ghost mantis (Phyllocrania paradoxa) nymphs that I raised from L2 to adults in the last couple of years.
I keep them in containers with sphagnum peat moss. I mist their habitats lightly every day (not directly on them as they don't like it, and that small of a nymph will drown in a water drop), in the past I've misted once a week and had no problems then either. Ideally you want to stay at 50-60 % RH (room humidity) in their containers, if you have a hydrometer you can get precise, but never found it a issue (and I have two hydrometers
). Heat wise they get whatever my room temperature is, it tends to hover at 72-75 F. Other than that I ensure they have plenty of Melanogaster fruit flies, adding some daily for larger hatches (I aim for 2 per nymph, but I don't bother to count and just go by the amount I see in the container). I try to ensure they have fruit flies at all times, but that is more for cannibalism, which with a single nymph won't be a concern.
If you are stressed and feel like you need more specific care take a look at the caresheets for
Chinese (Tenodara sinensis) and
Ghost (Phyllocrania paradoxa) mantids.
Best of luck with your new nymph.