I'd be very mindful of both flow and light level right from the start because it can be very hard to move an anemone once you place it in your DT. Recommendations for light and flow are all over the place for almost everything in this hobby and nems are definitely no exception. Most seem to say moderate to medium-high flow. However, that was not true for my happy BTAs and LTAs---they all seem to much prefer low-medium flow. Regarding light, most seem to say medium-high lighting. Again, my nems beg to differ and seem to prefer moderate lighting (~125-150 PAR). I put my nems in spots where they only have to move short distances over rock (no sand) to find almost any combo of flow/light. I have five nems now. Three are very happy and never moved very far. Two seem very unhappy after they settled on spots that I think have terrible light and flow---but they won't move, so I don't know what to do other than worry about them.