Help ID please - white crystal-like structure...

[ScoobyJ]

Hi all,

I was searching my tank for Aiptasia and I came across these white crystal like things? eggs? aliens? sponge?

It's on the underside of my rock, pictures attached.

Any thoughts?

Thanks everyone!

 

[Mikedawg]

Stalactite? LOL. Possibly sponges given "mouth" structure. Nice find