ID plz

[The Grizzly1]

They just showed up and seem to be spreading
My first try to post so if pictures don't show up I'll try again

View attachment 20170728_151732.jpg

View attachment 20170728_151732.jpg

 

[Palyzoa]

Looks like a strawberry anemone, usually not a problem. I have some in my tank as well.

 

[Palyzoa]

Or a ball Anemone

 

[Gweeds1980]

+1 for ball nem... do they come out at night? If so, deffo a ball nem. They stay small and are pretty cool imo... apparently have quite powerful stings tho.