Urgent Please help identify aggressive unknown colony in substrate

okay, have you tried touching them?
Are they all soft, or do they have a hard base?

 

Is there any way that when someone gets a notification, there's a pop up or something? I never see I have a message unless I happen to glance up in that corner.

Going to go watch your channel now.

 

Can you get a picture? Is it absent of tentacles or did the video just not pick them up? I assume it's just the video.

What have you seen it doing with the snail? Start to finish, if you could.

The one you pulled up, did you squish it? It didn't have a coral type skeleton, right?

Use the Google image search and look up sea anemone for me and see what you find. You can't get bogged down by an exact visual match, because there are so so many different ones. Look at the stalk and see if it's similar. Open a couple of the links and see if you find behaviors described similar to your own experience.

Look at this link and see if you find any similarities. Anemone not that I think it's exactly that, but it may help us peg some features.

 

I just saw the other video you had that I missed. Really looks like a sea anemone. Would guess Cnidaria -> anthozoa.

 

Thank you for taking a look Renee.

The tentacles appear to be moving in the images but not relation to the flow.

From what I gathered it also has a semi-solid structure from where the tentacles originate.

I sure see similarities in the link you posted and the images in the video.

I love a good mystery and wish the OP would chime in with more details or images.

 

There are sea anemones that have all those characteristics. Would love some more data and pictures.

 

Unfortunately not that I know of.

 

Sometimes it takes me days to see them. I guess visitor messages don't show up on Tapatalk? Prolly not. Sorry to distract, but I always feel bad when I don't respond in a timely manner.

 

I would suspect that there is less available on mobile apps.

 

I have seen these before. They are one of many species of colonial hydroids. This species is very agressive and will sting fish and corals. The scarlet hermit is the only preditor i am aware of. You likely have swimmers of this species as well. They look quite simular to tiny jelly fish.