A few days ago, I found a single Aptasia near the glass in the sand. I sucked it out!! This morning, I find one on a small piece of live rock. I've also seen a couple bristleworms crawling in and out of holes in this same piece of rock. When I tried sucking the aptasia up, it just sucked into it's hole. I've read about some remedies using lemon or lime juice (don't remember which) or boiling water. I've also read about cementing the hole shut. Should I remove the rock from the tank before doing any of these? Should I rinse the rock in fresh water afterwards? This particular piece of rock is very easy to remove from the tank. What would you recommend as the best way to kill this lil' goober??