Yep, it's P. ciliata. I've had a yellow color morph as well since about December, and it's molted at least three times and is still yellow though there isn't really anything yellow in the tank. I've found mine to be quite active and willing to spend time sitting out in the open, which was not my experience with N. wennerae, another stomatopod from the same areas. It's eaten some porcelain crabs which I figured might be on the hit list but has totally ignored large and small serpent and brittle stars, corals, a chiton, large and small snails, large and small featherduster worms and plants. It does uproot things/move piles of sand around from time to time, which is to be expected, as they burrow in the wild. It's interactive, too. It will "beg" for food if it sees me by the aquarium, but hides from strangers. Neat animals.
I can't recall what post it was off the top of my head but Dr. Caldwell threw forth a theory that (and forgive me if I got the gist of this wrong) yellow individuals seem to come from visually complex environments (like the reef?), so their color is not so much to blend in as to attract mates. Other color morphs, due to their habitat, may have to blend in more to avoid being eaten, whereas yellow-morph individuals live in a complex environment with lots of hidey-holes nearby and can afford to be pretty because they can escape quickly from danger.
Long story short, yellow ones are maybe more likely to stay yellow?
