Can anyone identify this?

[mhayes462]

It looks man made, but can't be. I thought at first it was on the outside of the tank. Could it be snail eggs?

Mike Hayes

 

[al&burke]

Snail eggs

 

[geoj]

Nudibranchs deposit their eggs in a spiral, as viewed from above and starting from the centre and working out.The spirals are of the Archimedes type, that is, with equally spaced whorls.

Flat egg mass

May be nudibranch eggs

 

[mhayes462]

I have a lettuce nudibranch, so sounds right. Thanks
Mike Hayes