I don't think it's either, I think its a little bleached offspring of that rhodactis mushroom to the left of the picture.
Actually looks more like ricordea yuma if you have any of those.
Nick
nope, you're right, they are ball anemones.
Nick
We live in the artificial rock, kill everything that isn't a coral with fire generation...
If it was me, I'd say leave them be, 3 is hardly a plague, innocent until proven guilty. They're also quite attractive.
I suspect the rest of the replies will involve pouring some sort of corrosive substance on them.
Nick
That big.
Nick
I'd agree with Nick and leave them be, but I'm not convinced that first one is a ball 'nem. Be interesting to see an updated pic in a six months time.
Tim
Please doWould be nice if it is a Yuma...
will try to remember to update in few months time
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The first pic looks like a corynactis anemone but the other photos look like pseudocorynactis.