Not sure about the first pic. If it doesn't move it would most likely be a type of sponge. They feed off excess nutrients in the water.
The second pic is what they call "spagetti worms" harmless and feed off excess food and such in the water. Do a surch in google for spagetti worms and you should be able to read up on them...
Presume, the first pic is relating to the green in the centre of the pic, and that is a sponge, harmless filter feeder and agree as above with the spaghetti worm...