What is this and good/bad in a nano reef?

[Digimes]

Found this crossing a rock. Kinds looks like part of a starfish and moves like one too. Trying to figure out what this is and determine if it needs to be plucked out of a nano reef.

 

[BOYERZ]

Asterina starfish, some say they are good, some say they are bad.

I like them, there is probably 50 or so in my tank.

 

[Digimes]

Also found this hanging around....

 

[bushdoc]

Found this crossing a rock. Kinds looks like part of a starfish and moves like one too. Trying to figure out what this is and determine if it needs to be plucked out of a nano reef.

I will answer with my own quote from neighbouring thread:
Judging from response here and my lifetime experience, I would say:
"One man pest is another man beneficial helper"
The question is: Which man are you?

 

[BOYERZ]

Also found this hanging around....

Hard to tell, looks like a stomatella.

 

[EeyoreIsMySpiritAnimal]

Also found this hanging around....

What is that!! A R2R guide to common new tank hitchhikers.

One of the greatest things about starting a reef tank is getting your live rock in and admiring all the diversity within it. The rock comes to life different creatures. This is a guide that I, along with a very well known critter identifier @KJ , have put together for the new reefer on what...

www.reef2reef.com

 

[Digimes]

What is that!! A R2R guide to common new tank hitchhikers.

One of the greatest things about starting a reef tank is getting your live rock in and admiring all the diversity within it. The rock comes to life different creatures. This is a guide that I, along with a very well known critter identifier @KJ , have put together for the new reefer on what...

www.reef2reef.com

Really great thread, bookmarked and thank you!!

 

[EeyoreIsMySpiritAnimal]

Really great thread, bookmarked and thank you!!

There are more sticky threads at the top of the forum...

 

[Digimes]

UPDATE QUESTION, I have spent hours reading and searching but cannot figure out what these little guys are. They don't seem to bother the corals and don't retract when touched. They are not clear like spionids and they are not bristle worms. Any ideas on what I am missing? They are similar to size and color of baby brittle starfish arms but I don't think that is what they are. They are banded, dark and light grey. Some poke out of rocks and others are underneath frag plugs but none are growing in or through any actual corals.