critter id

[grant778]

https://farm4.staticflickr.com/3871/14642063624_32e00e4921_c.jpg
My first thought was that it was aiptasia, as it has tentacle things at the tips, but the stalk is so thick that I don't really think its aiptasia.

[Misled]

Google pinapple sponge. Can't tell much from the pic.

[Sugar Magnolia]

Yep. Harmless scypha sponge aka pineapple or q-tip sponge.