Please identify good or bad?

[fishy27]

This is in my tank, it started from a frag of zoa's I bought. I noticed it today starting to grow on my rocks and was wondering what it is and if it's good or bad?

 

[NYreefNoob]

what are we looking at

 

[fishy27]

They look like some sort of feather duster.

 

[Treef]

those look like yellow polyps...if they indeed are than you should probably keep them separated from your main rockwork as they grow quickly and can kill other corals.

 

[fishy27]

those look like yellow polyps...if they indeed are than you should probably keep them separated from your main rockwork as they grow quickly and can kill other corals.

should I get rid of them then?

 

[DontXtripNfall]

keep them isolated so they dont over populate ur rocks if they do turn out to be yellow polyps.. whatever they are they're pretty cool looking

 

[KathyC]

Can you take a pic of what they look like from the other side so we can see the 'structure' they may be growing out of..or touch them so they close up and then take a pic.

 

[fishy27]

Can you take a pic of what they look like from the other side so we can see the 'structure' they may be growing out of..or touch them so they close up and then take a pic.

These are the best pics I can get, I hope they help. Thanks for all the help.

 

[muntai]

hydroids, bad for reef. they spread fast n sting others. theres a hitchhikers sticky link somewhere in this site. can't seem to find it now.

 

[fishy27]

hydroids, bad for reef. they spread fast n sting others. theres a hitchhikers sticky link somewhere in this site. can't seem to find it now.

One little rock that you see I can just take out but how should I get rid
of them that spread to my LR?

 

[DevIouS]

Put frag glue or epoxy over them.