Unidentifiable hard white things

[Schteeve]

Hey all,
does anyone know what these might be? they've popped up all over the tunze box and the glass interior. they're small, white, hard, always in the same incomplete circle shape and scrape off very easily with a glass scraper.

Tank inhabitants:
Trochus snails
Ghost Shrimp
Clown fish
Psuedochromis
Azure Damsel
Hermit Crabs


Identified hitchhikers:
Feather duster worms
Vermatid snails
Aiptasia

 

[WV Reefer]

Hey all,
does anyone know what these might be? they've popped up all over the tunze box and the glass interior. they're small, white, hard, always in the same incomplete circle shape and scrape off very easily with a glass scraper.

Tank inhabitants:
Trochus snails
Ghost Shrimp
Clown fish
Psuedochromis
Azure Damsel
Hermit Crabs


Identified hitchhikers:
Feather duster worms
Vermatid snails
Aiptasia

spiorbid worms. Good guys.

 

[Schteeve]

spiorbid worms. Good guys.

Ah so they are! thank you

 

[VKP01]

Second spirorbid worms. Won’t hurt anything, just make sure you don’t get them between a glass scrubber and a the tank or they could scratch it

 

[Schteeve]

i popped my microscope up against the glass and could see their tiny little feathers/tentacles. so small!