yeah when I worked at a LFS we would get batches in and test them out with some rocks that had aptasia on them.
Some batches did and some didnt(Depends where they came from but I never got that info out of the destributor)
When we had a batch that ate them we would lable them as such.
Although be warned they usually will not eat aptasia untill everything else has been eaten(as in pods, worms and such).
I have discovered that a small fuge like setup with 15-20 peps and a rock or two in it is a great QT/ cleaning station for new frags. They will eat EVERYTHING off them, as long as you keep them hungry. Just have to figure out how to employ that on my next tank setup.