Help Identify these please?

[waynotcars]

Hi,

These are popping up on my rocks kind of everywhere. Best way I can describe them would be like little white cacoon type things, kind of egg shaped with a little hole in center. Have no idea what they are.

 

[dubs]

pineapple sponge they are good

 

[waynotcars]

Glad to hear that they're good. In what way are they good? Thanks again

 

[dubs]

filter feeder

 

[waynotcars]

Thanks, I'm relieved. I thought they might be bad and there are quite a few of them. These have appeared about the same time some stomella (spelled wrong I think) snails have started appearing.

 

[dubs]

the stomatolla snails are good 2 good algy eaters