Reef Pest ID

[MJ59HK]

Can someone please let me know what is that stuff growing at the back of my tank? I first noticed it two days ago. It seems to be getting bigger. My zombie snail has been stuck to that area for the whole day now. It doesn't seem to be able to move away from it. It's like that patch thing has caught it and it is struggling to get away from it.

 

[WheatToast]

Can someone please let me know what is that stuff growing at the back of my tank? I first noticed it two days ago. It seems to be getting bigger. My zombie snail has been stuck to that area for the whole day now. It doesn't seem to be able to move away from it. It's like that patch thing has caught it and it is struggling to get away from it.

They appear to be Nassarius (Zombie) snail eggs! I have read that the young will probably not survive (eaten or filtered out), unfortunately .

 

[MJ59HK]

Sorry another noob question. Can someone let me know what are those string looking things attached to the rocks and substrate?

 

[Uzidaisies]

Sorry another noob question. Can someone let me know what are those string looking things attached to the rocks and substrate?

hydroids