What the

[Hbohi]

What the heck are these

[rssjsb]

The first and second pictures are stomatella snails - great algae-grazing hitchhikers. The third and fourth are pineapple sponges - harmless filter feeders. Can't see enough detail to tell what the last picture is - maybe a sponge or aiptasia.

[Hbohi]

Thank u