Aiptasia? I.D needed..
 

Is this aiptasia?

It's about 1/4 inch tall. Never come across them before so I'm not quite sure if it is or not.

Just above the little feather duster.

http://img15.imageshack.us/img15/3747/img3918z.jpg

Note: The tentacles don't appear to be as pointy as most aiptasia I have seen on the web.

Looks like it to me. There are different aiptasia species, so don't be fooled by the appearance!

Oh great. What a fantastic christmas present! :lol:

Aiptasia X looks like an easy solution. Or a chisel and hammer - losing 50 grams of rock isn't going to kill me.

that's what I used...hammer, but lost most of that rock since it was infested with aiptasia, and it looked exactly like your photo above, but was all different sizes....I wouldn't panic with just one little one though, but good idea to get rid of it, it apparently spreads quickly

turn the pumps off and squirt a shot of 100% lemon juice into its mouth.

Aptasia X works wonders. Death within 15 minutes!!

Try the Lemon juice. I have had success with this on single aiptasia. I had an outbreak though. I would've destroyed my alkalinity trying to squirt lemon juice into one hundred or so aiptasia. I bought peppermint shrimp, and haven't seen a single aiptasia since. It took buying quite a few shrimp (I have at least half a dozen in there), but after a few months, the aiptasia is gone.

I read an article in Coral Magazine recently that said there are 2 different species of shrimp sold as Peppermint Shrimp. The pictures looked nearly identical. One eats aiptasia and the other does not, which is why you are best to purchase a small group of these shrimp to ensure you actually get some of the aiptasia eating species in your purchase.

Only one? Suck the whole thing up with hypodermic syringe. No additives/chemical. Simple physical removal.