ids on these please :)

here are a few pictures of some of the things i have found in my tank that i would like help identifying. any help would be awesome. i just want to make sure that none of these are harmful.


several of these are now being found around the tank.. look to be some kind of filter feeder. the little fans will pop back in when something gets too close



just two spots with this..



thinking this is some kind of algae. mostly only on one rock, its starting to get more noticeable





if i watch and stare really hard i can see the ends move and sometimes a stringy substance coming from it.. kinda like a spider web floating in the wind so to speak. many of these are popping up.



any help would be great..sorry my pics are not really that good. probally the best i can do right now. been trying to practice taking pics

 

Other than the Caulerpa algae, the rest are harmless

 

thank you for the quick reply!! what would be the best clean up crew member to get rid of the caulerpa algae??

and as for the vermetid snails, wouldnt they move around? these guys are stationary. i am still new to this so i am learning something everyday!! it is very exciting. i sit and stare at my tank everyday after work.

 

Nope, they won't move around. They are cemented to the rock.

Monterey Bay Aquarium: Snail (Vermetid Gastropod) Feeding Video