What is this?

[amandaraejean]

Hey guys, found a hitch hiker. Not sure where he came from or if he is good or bad. Any info helps!

 

[rvlcf]

Asterina star. I've had them before, never bothered anything, and then they disappeared.

 

[username in use]

Yeah, they are fine.

 

[lifeoffaith]

Some can be coral munchers, but usually the rule is if they are green they are more of a concern. I had lots of them in my old tank which was a fish only tank, haven't had them in a coral tank before.

 

[sde1500]

I have them show up in my tank occasionally, and found them on corals a few times. The zoas didn't seem happy, so I pulled it out, better safe than sorry.