Those are a freshwater crustation if I rememer high school biology.
I think that questions like these are hard to answer with a definative answer becaue there are so many other variables in a tank that affect color and health/growth of SPS. Its difficult to tell what effects it would have (good or bad) to the SPS, and more specificaly which genus. But it is a small creature that does not pollute the water,(compared to larger sized foods in the water), and I think diversity in food is key.....because we are not 100% percent sure what the dietary needs of any are, so I wouldn't think it could hurt or help much.....
I used them for a while, but don't know the impact. However, one thing I am sure of is phyto....even time I run out and take a while to get to the store to pick some up, my colors ALWAYS fade.