What are these? Are they bad?

[LogCorn]

 

[tangtime]

Palys. Not bad but I personally wouldn’t want them in my tank.

 

[Dsnakes]

Looks like a fairly new tank. Did they come in on liverock? They aren't bad if you like them. They will spread quick and cover your rocks if not contained.

Use precautions and safety glasses/gloves if attempting to remove. Look up some info on palytoxin.

 

[LogCorn]

Looks like a fairly new tank. Did they come in on liverock? They aren't bad if you like them. They will spread quick and cover your rocks if not contained.

Use precautions and safety glasses/gloves if attempting to remove. Look up some info on palytoxin.

Oops.. I just grabbed the rock out and scrubbed them off with RO. Is that bad?

 

[tr3]

https://www.advancedaquarist.com/bl...-poisoning-almost-killed-myself-wife-and-dogs

 

[tablesalt]

It's not the exact same thing, but looks pretty close to this.

https://www.fishnreef.com/zoas-palys-polyps/sbc-blue-spirit-palys.html