Can someone help identify?

[AnnaKAF]

So, I have a few growing things that I have no idea what they are and what shall I do about them.
1. There are a few big irregular shape things which I did not dare to touch on the walls of the sump and in the overflow section of the tank. Maybe 5 or 6 total. Size of a good snail.
2. And there are billions of what I think called spirobid worms. I scrape them off from the glass, but they are on the rocks, inside the sump and around the pipes. I know they say they are beneficial… but so many??? Aren’t they going to clog the system some day?
3. And there is a blob of some light green formation on a rock, kinda between the rocks, in the shade, that doesn’t look like anything I saw anywhere online before.

Who knows what are those???!
Please, help!

My tank is 8 months old.

 

[smitten with ocean life]

there can be all sorts of odd and interesting things in a sump! might need some more pics to see what all you are talking about