white things growing? help plz

[1337cr3w]

The other day i notice two unseen before growing white things on my LR help me identify them plz and figure out what to do.







these three are of a wierd small cone shaped thing that is just kinda shooting out of my rocks




this is a mesh looking thingy that is growing on the surface of one rock.

help plz.

[Bloodasp]

the first one looks like a pineapple sponge. the second one I don't know, some type of calcerous algae, maybe?

[ScubaSteve]

Sponges. No need to worry. The fist ones, though the pics aren't celear, look like pineapple sponges. The last one I have in my tank. Don't know the name though.

[1337cr3w]

is the last one a sponge though? and still not bad?

[ScubaSteve]

Yeah, pretty sure. If it's not a sponge it's still harmless. I have a bunch in my tank and they've grow to look pretty cool.