Could it be?

[stephish]

Do I have eggs?
sorry the pic isn't the best but these are attached to the lr in a low flow sheltered spot.

 

[valgae]

looks like snail eggs.

 

[110innc]

Id say so

 

[dogfaceman]

be safe and remove them, maybe a quarantine tank

 

[cranberry]

eggs...... from afar they look like little balls. Some ceriths lay a little different pattern and are nice and neat. But these guys are just clumpy.