I am not sure what are these, help please

That means you have a ever stable system if you start seeing them pop up keep it going and happy reeffing 
@edrisnasri55Most consider them a nuisance but I've read they don't spread like the other nuisance anemones.  Some like them and keep them. 
I have a bunch of those in my tank, and they don't seem to hurt anything.  I like the way they look when the lights are low, as in your first pic.