Coral

[Themonsterisme]

Don't remember the name of the bubbly looking corals but was curious if the arms/tentacle things coming off of it were algae or the feeder arms

 

[Themonsterisme]

Full tank shot

 

[Reeffanman]

You mean the candycane coral? I would say the arms are from something underneath the heads can you get a pic from the side of the tank where the powerhead is. You might tell better from that angle

 

[Droneshooter]

Yeah that's not from the candy cane coral there is something else growing on it don't know what most likely the algae your asking about

 

[sageharmon]

Looks like brittle stars to me...

 

[Themonsterisme]

Just noticed 2 aptasia on it..

 

[54seaweed]

looks almost like caupulara a macro algae especially in this pict it grows fast and can smother coral those vines can go everywhere i'd yank it put it in the sump if you have one
see if you can match it up here
Marine Plants In The Aquarium: An online guide to the identification and care of marine plants and macroalgae in the aquarium.