What is this?

[Fishy888]

My guess is that this is a coral of some sort. It looks like a zoanthid. At first I thought it might be an anemone however there's a bud on the stem. This is the first time I've seen it open since I got this particular rock. The tentacles are white currently but hopefully whatever this is can regain zooxanthellae soon.

 

[ying yang]

Think a clearer picture going be needed,your picture just one big blur unfortunately

Maybe clean glass good then have white lights on tank or a flash on phone /white torch light and hold phone to glass to take picture

 

[Fishy888]

I will try again. Hopefully I can do better.

 

[Fishy888]

Here's a better picture. It's not perfect but it's the best I can get. Seeing it from this angle makes me think it's a good anemone. There are a couple of aiptasia on that rock too and a bunch of small feather dusters.

 

[ying yang]

Yeah can see what looks like the foot off an anemone where outlined and the tentacles above.
Unsure what kind but hopefully others can id for you.
Defo not a zoa though and looks like a feather duster behind.
Can see white tips in my zoomed in second screenshot.

Look up majano anemone,see if similar

 

[Fishy888]

I thought it might be a majano. I'll have to see. If I had to have a pest anemone though majanos are the most beautiful so they'd be the ones I'd want. I am hoping it's a BTA though.

 

[ying yang]

https://www.reef2reef.com/threads/majano-anemones.319832/Little thread to compare but seems you on it already.
Yeah be nice if a bta.
So where it came from you think ?
New live rock?
Some new corals?
Or just randomly noticed?

 

[reeferguy3303]

Kinda looks like Ball anemone , need a good picture

 

[Fishy888]

It's from new live rock. I've had this particular rock for a month give or take. Today is the first day I have seen it open.

 

[Fishy888]

After reading this article...

https://www.reef2reef.com/threads/n...ny-chance-someone-can-id.926255/post-10434866
I believe this is indeed a ball anemone. Time will tell. Once it grows some I'll update this. Assuming it's a ball anemone it's an NPS coral. It's tentacles may or may not color up eventually but it won't have zooxanthellae if it is indeed a ball anemone.

Thank you everyone for the help.

 

[WheatToast]

My guess is that this is a coral (though they look like anemones) in the family Corallimorphidae, related to mushroom corals. The ball anemone (Pseudocorynactis caribbeorum) is a common member of this family in the aquarium trade and is nowhere near as invasive as Aiptasia, but the organism in question looks very similar to another member, the strawberry anemone (Corynactis californica). This species is also non-photosynthetic.

Pseudocorynactis caribbeorum:

Corynactis californica:

 

[EeyoreIsMySpiritAnimal]

My guess is that this is a coral of some sort. It looks like a zoanthid. At first I thought it might be an anemone however there's a bud on the stem. This is the first time I've seen it open since I got this particular rock. The tentacles are white currently but hopefully whatever this is can regain zooxanthellae soon.

Regardless of the ID, if it doesn't rapidly multiply then it's relatively harmless. I have 2 large aiptasia in one tank that have been there over 2 years and have never spread... They're quite pretty!