Stuff on my live rock

Don't know if this is the right forum, Can enybody help to ID these. The last image is hard to distinguish but all i can say is they are like fine threads that seem to come from one point, there may be as many as five and they seem to be able to strech along way about 2-3 inches and when you tap on the tank they shoot back into the rock.

Many thank's.

 

need some pics. could be aiptasia.

 

Just sorted it out.

 

third pic looks like a feather duster worm. nothin wrong with that. the 1st and 3rd look like forms of macroalgae , which are normal and not a prob by the looks of them. sorry cant figure out the 4th.

 

Aiptasia
Feather Duster
Vermetid Snail ?
Green Hair Algae

 

sorry 2nd pic a duster. 1st and 3r macro's

 

The things with the long tentacles could be either a chaetopterid worm or a spionid worm. Hard to tell which unless you take it out of the tube. They're harmless in small numbers. I'd just watch how much you feed your tank

 

Thank's for the help. After doing an iamage search it looks like the fourth image is a spionid worm.

 

1. aptasia
2 feather duster worm
3rd. tube worm
4th ????