Can anyone identify this?

[Kev Smith]

My tank is 6 months old now and I spotted this growing on two LRs and wondered what it could be. All my water parameters are good and stable, corals and fish are "happy", but I have no idea what this is? Can anyone advise me what it is and if it is good or bad?

 

[Squid]

Looks like it might be sponges

 

[Playa-1]

Hard to say, does it move around like tentacles? or more fixed.

 

[reeferfoxx]

Sponges.

 

[Kev Smith]

Minor swaying when powerhead kicks in but otherwise no movement

 

[Salty1962]

Tunicates?

 

[saltyfilmfolks]

sponges or tunicates. if its a tunicate look very close and you'll usually see them "feed" by gently moving the mouth parts on the tube to get flow through. sponges do the same but you cant see the process.

 

[Kev Smith]

Can anyone identify this mark on my Skunk Dottyback. It appear yesterday and looks more like a scar than spots? It goes over to both sides of the back.