Kinda confused on this one too. Some of the pics I see looks like tube worms. Or is tubeworm more or less a generic name for aptasia? I've been told I have tube worms in my tank, and that it takes good water for them to grow. If that's the case, then I must be doing something good cause in places it looks like they've got their own little forest going on. Then again, if it's aptasia, I may be getting a few pepermint shrimp! lol