[kdpuffer]

From my understanding with aptasia, any little peice left behind will result in lots of replacements. I had what I suspected of being aptasia and upon closer examination there was also a large bristle worm about three inches long in the same small fragment of rock. So, to make life easy I just got rid of the rock, but from the posts iI have read, peppermint shrimp are the most readily available form of anti-aptasia there are. Not all will eat it though, so see if someone will lend you a specimen to treat the aptasia.