What might this be?

[antigonus]

I have seen these strange things in my tank for a few weeks now, they look sort of like little white orbs connected on top of transparent stalks or tentacles of some sort, at first I thought they might be eggs or even some sort of anemone. I've had Aiptasia before and these seem completely different. 

I'll attach a few pictures even though the quality is pretty bad, has anyone seen something like this before?

 

 

[Ratvan]

Looks like Ball Anemones 

[antigonus]

39 minutes ago, Ratvan said:

Looks like Ball Anemones 

Thanks, are they dangerous? I have noticed some of the Palythoa one is next to has been closed. 

[Ratvan]

53 minutes ago, antigonus said:

Thanks, are they dangerous? I have noticed some of the Palythoa one is next to has been closed. 

Most likely not. They're unlikely to overpopulated and crowd anything out. You can deal with same as aiptasia

[empresto]

 I've got a number of them in my tank. Largest is about an inch or so wide. They don't harm anything and are quite pretty under the moon lights.