White swirly egg casings?

[Paulyboy123]

Can someone please tell me what these egg casings are? Good or bad?

 

[Flreefer]

Hey Paulyboy, the first pic looks like a Spirorbid worm tube. The others may be the same thing or the start of coralline algea spots, hard to tell.
The Spirorbids are a harmless, natural progression of a reef aquarium.
Best of luck with your tank.

 

[Paulyboy123]

I also have these little spiky slug things crawling in my tank laying the eggs all over the glass