Help, what am i looking at?

[Brodie]

So i have just got my first tank and it is going well but the live rock i have put in is bustling with life and i can't tell if it is good or bad life. Can someone please tell me what the things circled in the photos are.

 

[KJ]

Pic please.

 

[Maritimer]

Photos didn't show up for the party . . .

~Bruce