Nate, I knew you had picked up some stuff. I'm glad you saw the thread. I've been finding the best way to see them is by taking macro shots with the flash on. I leave the coral out to dry for about 10-15 minutes (at min.) and then take the closest shots I can. The flash makes them stand out, even against the same colored flesh. Also, the young are very small and I haven't been able to see them at all with a mag. glass. They do show up with the macro trick. They don't really move around when out of water, I've found that holding the coral just below the surface of the water and taking pics, with flash again,you'll be able to see the very small young FWs moving across the coral.
The mandarin I put in the frag tank with the FWs is a spotted, Synchiopus picturatus page 339 of Scott Michaels book (just to remove any confusion)