Spagettti worms
 

I have lots of spaghetti worms and I have never seen this in 4 years.

Weird thing. Have you tried moving it or flipping it over?

nope haven't touched it yet was gonna wait till tank clean up tomorrow. Should I move it or just leave it for a bit and see what happens?

I'd leave it and see what happens. I like to live on the wild side,lol.

My bet is on the snail. Some snails make pretty unique egg cases. I have seen interesting egg collars off the coast of Galiano Island made by the Moon snail, they look somewhat similar.

Typed in every word in google i could think to describe what that looked like to me with no hits. Cause I 've seen them before, I just can't remember what they were. Finally the guy above mentioned egg collar or sand collar and i got hits which looked pretty similar to what you have.

I think it looks like a crop circle...:lol:

These are snail eggs. If you search on google, "MOON SNAIL EGGS" (pacific west coast species of snail illustrates it very well) they are very interesting. I am not sure the species of sand sifting snails you have.

cheers

What is the size please? Dinner plate? Loonie? dime?

it does say in the thread it is about 3-4 inches

Does sort of look like moon snail eggs

http://www.andrewjmartinez.com/image..._egg_case.html

http://www.wildsingapore.com/wildfac.../naticidae.htm