what the heck are these white circles?

what the heck are these white circles/ovals that have formed on my rock almost over night?

 

hard to tell exactly from that pic, but I would guess tube worms

 

The culprit is most likely at the top of your pic, nerite snail eggs. They will most likely not hatch as they need brackish conditions for that.

 

Definitely not tub worms they are round smooth disks and @2in10 I have a semi brackish tank what would the salinity need to be for them to hatch, I could also use a Tupperware and spare hob filter to run it, you can never have enough CuC lol

 

bump, some more reassuring opinions to the nerite snail eggs or other ideas on what they may be

 

Picture is hard to tell. Sponge maybe?

 

definitely not sponge hard white disks and not porous

 

im positive this is them, i googled nerite snail eggs and this is what came up

 

You could probably drop down to 1.003 SG. Try searching for how to hatch nerite snail eggs. Never checked it out myself.

 

Will do