Polyp

Ive been looking at an upside down looking umbrella growing on my live rock for about 2 weeks now and seems to be growing more and more very small amounts each day i. Well 2 days ago i noticed that under the actinics the inside of the upside down umbrella is glowing. I think i have my first coral ;D, and there are actually 3 of them but the others are small. dont know what color it is yet but i think its a polyp. it has a tube coming out of the rock and then the upside down umbrella. It shrinks into the rock sometimes. what is the best thing to keep the growth going?today i left myt actinics on all day because i have some algea covering my live rock and i want it to go away. I have read that frags like the blue light?

 

If it's growing as it is.....let it be. Got pics?

 

hmmm........

I have a feeling this is Aiptasia

 

its extremey small, i will try to take a pic. I actually took one but kinda blurry.

The cup of it is what actually shrinks, then it opens up into the upside down umbrella

http://www.3reef.com/forums/members/xfactor6-albums-26-bow-picture802-dsc020281.jpg

 

Does the mouth glow under actinics?

 

i don't thank so.
does it look like it has feathers. the pic is really small so its hard to tell. if it looks like it has feather and a tube. its a feather duster, a worm that filter feeds

 

Sorry for my crude paint drawing but this is what it kind of what it looks like. the middle is yellow under actinics. not feathers, they arent wide.

 

its probably a button polyp or zoa, you shouldn't have to worry about it

 

probably just have to wait until it's bigger so we can see it then we can get you a positive ID on it but I wouldn't sweat it to much for now

 

I think phoenix is correct as that is what I thought. View it at night with a flashlight to see if it is clear or "see through". Here is a pic of one with a colony of button polyps so you can see the difference.
Google Image Result for http://upload.wikimedia.org/wikipedia/commons/9/9b/Button_polyps_and_Aptasia_-_by_BJ_Beggerly.jpg