Several new things in new tank

[An_Enemy]

Hi! There's a few things in out new tank that I wondered if anyone could identify.

Some shots are a little hard to make out, so I apologise in advance!


There are these little tenticle things on the live rock, but it's behind a ridge so we can't see the rest.

I noticed one of these hollow brown tubes drifting around the sand yestersday. I thought it might just be some debree from the sand, but now there are three of them.

There's this little green stalk that sprouted under the live rock.

Really blury shot, but it looks like a tiny mushroom.

Thanks in advance for any responses. ;Happy

 

[cloak]

The first one looks like a harmless feather duster. The second might be a worm casing. The third is some kind of macro algae (Chaetomorpha?) & the fourth is a Protopalythoa I believe.