[Shooter7]

sorry, just kills me how the ID pics are always the most blurry as possible. Not sure how anyone could identify that first pic, so I'll just guess "coral". See if you can get a better pic and we might be able to help better.

The second one is definitely not a feather duster. If you say it's spreading throughout the tank, I'd be concerned about it being some kind of majano anemone. Also has some resemblance to ricordea. But if it is spreading quickly, a pest anemone is of concern. Again, a better pic would help be more specific in getting an exact ID.