Alien in my aquarium?

[Sunny in Miami]

I've seen this only one before this photo. If anyone can identify and tell me what this is please. My only guess is they are eggs from clownfish as they are the only paired fish in my aquarium.Can't imagine why they would put them on the window. Other fish is 1 Royal Gramma a Mandarine and 1 cleaner skunk shrimp. Also some snails.

 

[Sharkbait19]

Those are Nassarius snail eggs
Clowns breed on rocks under their nem/coral.

 

[Sunny in Miami]

Thanks for reply. Think they could hatch or will they be devoured before they hatch?

 

[Sharkbait19]

Thanks for reply. Think they could hatch or will they be devoured before they hatch?

I think they have a good shot of hatching. Oftentimes the small snails get eaten and a few will grow and survive.

 

[Sunny in Miami]