What are these things?

[Coldwater]

All these things have been found in my ten gallon mantis shrimp aquarium. The first on I know is a lot of 'pods look at them all. What are all the others?



This is a weird worm like thing that is a bout one inch long and has tenticles that stick.





Last are these two guys. There was only one last night and they dont move much.



Thanks for any help.

Matt