Are these fish eggs?

[Nancylarsen]

I have a 180g saltwater tank. I bought it 6 weeks ago. It was already a 3 year established tank. So far everything survived the moved. As well as a few new editions. We have three clowns, 2 blue damsels, 2 black damsels, 2 white striped damsels, 1 yellow tang, 1 mandarin dragonet, 1 lawnmower blenny, 1 chocolate chip starfish, 1 conch, 4 turbo snails, several hermits, 1 peppermint shrimp and two blood shrimp. Everyone gets along. Water levels are spot on. Tonight I was looking for my dragonet and noticed what looks like a smooth, round, white ball attached to a rock. None of the fish seem to be "protecting" it or attacking it. Can anyone please help identify it?

 

[Mike_J]

It looks to be a sponge.

 

[Nancylarsen]

Can a sponge just appear like that? I never noticed it before tonight. If it is a sponge, is it ok to just leave it be?

It looks to be a sponge.

 

[Mike_J]

Sponges are good filter feeders and a good sign of a thriving tank. It may have gotten bigger so you are just now noticing it. There is a very good chance you have more in your tank. Happy reefing!

 

[Nancylarsen]

That's great news! Thank you so much!

 

[Paul B]

I go with sponge. The only fish you have that would spawn are the damsels and this is what damsel eggs look like. They also guard the eggs.