Day of discovery

[RnBMum]

I did some tank maintenance a couple of days ago, and since the have found some pretty interesting inhabitants. I will share what I think they might be and hopefully you can set me straight. I apologize for the picture quality.

Feather duster worm (round with rays coming from a centre disc)? It withdrew into a hole very quickly and I had to wait ages for him to come out again... in the middle of the pic.


I think this little guy looks like an emerald crab. He has the hairy legs and long narrow claws, although he is not very green. His carapace is about 3/4" across. On the left side of the pic in the hole next door to the bumblebee snails.



Tunicates? Otherwise, I am stumped on this one.



And this one I have no idea about. It looks like it could be a zoa folded in half - almost like a Venus fly trap. Any hints?



Thanks in advance.


Allison
Freshwater fish-head for more than 20 years now, but salt water newbie.

 

[Mattyfelts]

1. defs a feather duster
2. not an emerald... i think its a zoanthid spider potentially?
3. sponge.
4.maybe a barnacle?

 

[mr_X]

It's a mithrax crab, like the emerald.

 

[RnBMum]

Mithrax, so it is not something I need to banish to the sump?


Allison
Freshwater fish-head for more than 20 years now, but salt water newbie.

 

[mr_X]

Well, that's hard to answer. The short answer is, in the sump it can't get into trouble. Sometimes they behave well, and sometimes they do not.

 

[RnBMum]

That is a very helpful answer. Thank you


Allison
Freshwater fish-head for more than 20 years now, but salt water newbie.

 

[chefbill]

the last looks like a little bivalve I had pop up, white with pink streaks.