Got these popping up

[Psiber_Syn]

These just appeared one day and have spread like fire they just regular plays or what?

 

[kschweer]

Looks like brown palys. Be careful they can become a nuisance.

 

[Psiber_Syn]

They have totally spreading quickly and not just on a mat like some here some there etc might scrape them off luckily they are just on 1 smaller rock now

 

[tom39]

+1 on the brown palys and the caution that they spread quickly.

 

[Tahoe61]

Be careful with eradication, they can be toxic.

 

[phantomreefing]

Nuisance my friend! They do turn a bright green tho

 

[saltyfilmfolks]

protopaly sand paly brown paly poly some common names. I use aptasia x on them. couple at a time. VERY high in paly toxin.

 

[CastAway]

Bright green like this?

I killed some brown palys and these were left, and I've wondered. Have any like this @Psiber_Sym?

 

[saltyfilmfolks]

different. some are Palythoa some are Protopalythoa
https://www.google.com/search?q=Gre...OZtarMAhXFMSYKHSOjC-UQsAQIHA&biw=1920&bih=955

https://www.google.com/search?q=Gre...HA&biw=1920&bih=955#tbm=isch&q=brown+Palythoa

good article on stuff
http://successfulreefkeeping.com/learn/about-corals/best-beginner-coral-choices/