Sammy put me on this a few months back...a lot of people also seem to do this, but, for those who don't, I can't stress enough that you do a freshwater dip on all new zoanthid colonies you add to your tank. Zoas are kind of my addiction, and I can't stop myself from picking up anything that is a nice color morph, so, I guess I'd be pretty vulnerable to parasites if I didn't follow this dipping protocol. Today I picked up a really nice looking yellow morph with a neon green skirt from one of the LFS. I got it home, and dipped it for 2-3 minutes in RO/DI water after swishing it in the bag water to get any gunk out of the polyps' mat. What bailed out is disturbing... two asterina stars, 20+ baby sundial snails, two zoa eating nudibranch, some flatworms, and, something I am assuming were redbugs. I've never seen redbugs before, but, these things looked like fleas -- kind of transparent with big red dots on their abdomen area -- does that fit the description? I know they don't eat zoas, and since I don't have any acropora in my tank, they'd probably of starved, but, the thought of zoa colonies being a method of transport for these pests into an SPS tank is kind of chilling. Of course, it killed off all the pods and the baby brittle stars too, but, the polyps are now happy as can be, it seems, in my tank, with no ill effects from the dip. Edit: I found this picture of them that Snausages had posted on RC... this is EXACTLY what came off the zoa colony.