Need IDs please

[Gatorfreak]

Looking for IDs on the following:
1. The white on this guy is just some sand soot. About 3" long. Some sort of cucumber?

2. This thing came with my LR. I tossed him. Curious what it was. Very small, maybe 1/8".

3. Some sort of plant or algae. Sorry pic is so bad.

4. I have no clue.

Thanks!

 

[XxTitleisTxX]

wow, youve got some strange things. Sorry i dont know what they are. I wouldnt be concerned about the last two

 

[Fluff]

I'll give em a shot.

1 I agree looks like some type of cucumber.
2 Looks an isopod, possibly Zuzara venosa (marine pill bug) From what I've read it says they feed on live and dead algae.
3 Is halmedia (sp?) Macro algae.
4 looks like a tunicate cluster. Neat addition.
HTH