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I feed mine cyclops every other day.

Sounds like a bristle worm. In small numbers they are not a problem.

Hard to say for sure, can you get a closer photo? Here is a photo of a Q-tip sponge from the archive if you need a comparison: Welcome to the board!

Yeah, I would guess it's a collonista snail, too, but a photo would help.

Nice specimens! All the gorgonias I've kept, photosynthetic or not, like a good strong current. I'd also try and reposition them to make sure that they aren't rubbing up against the rocks.

The polyp looks like a Palythoa or Protopalythoa. As for the algae, do a search for Botryocladia and see if that's what you have.

"Elkhorn" is a vernacular name used for species of both Acropora and Montipora. Do a search for Montipora hirsuta (also sometimes spelled hirisuta), one of the 'Elkhorn' montiporas. It looks very similar to what you have.

Looks like a gorgonia, perhaps something from the Eunicea or Muricea genuses.

It looks like a branching montipora, but I'd need a closer photo to tell for sure.

Yeah, I spend a lot of time watching the tank! Actually, the worm is pretty obvious once you look at the coral. I'm surprised it took me as long as it did to notice it!

Yes, the ones on the glass usually go away. What are your water parameters?

It does look like a colt coral. How much flow do you have in the tank?

Do a search for Spirorbid worms. If that is what you have, then it's nothing to worry about, they are harmless filter feeders.

How do you have it set up? How close is it to the surface? Is anything blocking the intake?

No, it pokes around like a bristleworm. It's constantly moving over the coral but I've never seen it leave it.

Thanks Cranberry :) As long as it stays on good behavior, I think I'll let it stick around.

Thanks Nissan, I used a Canon Xsi digital SLR with a 100mm f/2.8 macro lens.

I've had this Stereonephthya for several weeks but I just noticed this worm a few days ago. I thought it was a small brittle star at first, as I've had some on other soft corals, but it's definitely a worm. It's probably 6" - 8" long, and as thick as angel-hair pasta. It doesn't appear to be...

Yup, it looks like a sponge, and a nice, colorful one at that.

Are you talking about the white thing in the left-center of the photo? If so, I agree with Reefforbrains, it looks like a Porities skeleton.