I noticed some aptasia in my fuge so I dropped a couple of peps in it to take care of them and then I saw on another board someone was getting rid of them because their pod population was depleting.
Anyway, I have used ppmt shrimp to take care of my Aptasia problem. One thing you need to watch out is fake ppmt shrimp (aka camel shrimp). I *heard* they are not reef safe.