Any idea what this is?

[Eoka]

I found this on my rock just now and I want to know of it's bad or good

 

[nautical_nathaniel]

Some sort of anemone. Need a better pic with it more exposed for a more confident ID.

 

[Eoka]

Some sort of anemone. Need a better pic with it more exposed for a more confident ID.

Should I kill it just to be safe or is it harmless?

 

[kevgib67]

@ISpeakForTheSeas ?

 

[fishywishy]

Tunicate Maybe

 

[Eoka]

Some sort of anemone. Need a better pic with it more exposed for a more confident ID.

 

[Eoka]

Better pic

 

[nautical_nathaniel]

Better pic

Ball Anemone, some people say they're good but they can sting nearby corals.

 

[Eoka]

Better pic

Without added light

 

[kizzy89]

Ball anemone as said, i have one in my tank somewhere. Hasnt been an issue for me but that's not to say it won't be eventually.

 

[ISpeakForTheSeas]

@ISpeakForTheSeas ?

Agreed with Ball Nem (not a true anemone):

Looks like Corallimorphs/Ball Anemones to me (relatives of soft mushroom corals) - generally harmless and pretty neat.

That's a Ball Anemone - a Corallimorph. They're related to soft mushroom corals. They can sometimes multiply rapidly, but they don't usually cause any issues, so a lot of people like to keep them.

Some corallimorph species can be pretty aggressive like some nems, but the common ones in the hobby aren't.