I have a lot of these snail shaped calcium formations on Hammer’s and Duncan’s hard part also in the back of my aquarium back screen. They don’t seems to move and when I try to take them of it is stuck to the surface so I think it is some kind of worm making them.
I don’t mind them if it is not harmful
My bet is Spirorbid Worm
I don’t mind them if it is not harmful
My bet is Spirorbid Worm