That's excellent!! Thank you
that's exactly what they are! Wow, loads of conflicting information on Google though :/
I tried to siphon one out yesterday and it just broke. Didn't sting me though. I might try aiptasia X on one and see if that kills it? Or a toothbrush and siphon? Or I might just leave them unless they start bothering my zoas.
Thank you so much for identifying them for me