What's this on my Zoa colony?

[kzaveri19]

It seems to be killing my Zoa's. It's definitely not aiptasia, I tried aiptasia x on it and it still lives.

Thanks
Khurram

 

[Lionfish Lair]

Is it in a tube? It could just be an illusion, but I see 2 antennae that could be a vermetid. If it's not in a tube, could it be a hydroid?

 

[kzaveri19]

Seems to be in tubes . How do I get rid of them ?