Neon aptasia?

[West Texas Reefer]

Can anybody tell me what these neon polyps are that showed up on my new zoa? I assumed it was aiptasia, but never heard of a neon type. Thanks!

 

[ISpeakForTheSeas]

Welcome to Reef2Reef!

Those are super bright, which is kind of surprising. That said, they're either colonial hydroids or Nausithoid jellyfish polyps (probably from the Nausithoe genus - I'm currently leaning toward jellyfish personally); sometimes they're invasive to the point of tank breakdowns, other times they don't seem to spread much at all - in both cases, though, they reportedly do have a nasty sting for some people:
https://www.reef2reef.com/threads/are-we-sure-these-are-colonial-hydroids.797406/https://www.reefcentral.com/forums/showthread.php?t=2494739