Help I.d this

[noob reefer]

Not sure if this is where I should post but I'd like to know if anyone can I'd this small green wavy thing..as was watching it I saw it close up and then reopen..its super small and green hopefully some1 can tell by the picture

 

[noob reefer]

aiptasia??

 

[angieg1123]

+1 for pest anemone

 

[kakalakasha]

are they coming out of the tubes? Looks to me like it might be colonial hydroids.

 

[dragonfly1972]

Looks like a feather duster to me

 

[tektite]

100% colonial hydroids. I have them in my tank, annoying little things. They'll sting anything close to them and are very difficult to kill.