Those are Zoanthid polyps. Buttons look a bit different.
The "barrel" as you are reffering to is a Sycon sponge, sometimes called "Scypha sponge", completely harmless filter feeder.
Check this link: http://melevsreef.com/id/scypha.html
And yes, the "worm" is a bristleworm aka fire worm. Some are reported to prey on soft corals, especially if they get big. If you want to get rid of it, try getting a coral banded shrimp that's bigger than the worm himself. It might or might not get him, but atleast it'll keep the bastard at bay and the Coral Banded shrimp will help protect your corals. And yes, there are zoanthid eating nudibranchs. There are a few, without a picture, it's hard to say what species it is exactly.
If you spotted 20 or so nudibranch's on the zoo's rock, I would immediately take that rock out and dip it in coral dip or give them an iodine dip quick. Also, try quarantining the rock itself in a well lit area till every single nudi is dead.
After reading a lot of horror stories like that, I dip every coral I bring in to my tank.
_________
30g reef tank, CPR CY192 filter w/ DIY plumb running Rio 17HF return, Coralife 3x 9w UV Sterilizer, 3 24W T5-Helios 10K Daylights/3 24W T5-Helios Blue lights, 2 Logysis blue meteor light strobes (moonlights/24 Blue LEDs).
Tiger tail cuke, asst. snails/hermits, asst. feathers, rainbow acan,zoos,shrooms,bubble,galaxea, asst. shrimp, 2 ocellaris,mandarin,zebrasoma xanthurum,pink-spot watchman,red-striped pistol.
Last edited by rickzter; 05-12-2006 at 01:00 AM.
| 
dang lazy cleaner shrimp! 
