What are these?

[Jon T4S]

I noticed 5 or 6 of these things in my tank recently. They are slowly growing in size. Just wondered what they could be?

Thanks!

 

[Cell]

Asterina starfish

 

[Jon T4S]

Asterina starfish

oh, really?
Do they get big? should I be alarmed?

 

[sfin52]

Some say they will eat coral others say they won't. Seems to be many different species listed as asterina. They are also prolific breeders by severing arms

 

[sfin52]

oh, really?
Do they get big? should I be alarmed?

I have a couple about the size of a nickle to a quarter

 

[KK's Reef]

Some say they are pests, some say they are part of CUC. They don't get big but can reach plague proportions if they like the conditions in your tank.

 

[vetteguy53081]

I noticed 5 or 6 of these things in my tank recently. They are slowly growing in size. Just wondered what they could be?

Thanks!

A high reproducing star that stay tiny but multiply like mice by breaking off a leg and producing a new one and some as in my case can get to size of a nickel. I have none and have been at peace. Both break a leg and so forth and get high in numbers ending up in plumbing and sump and eating zoa coral. Theyre npt worth it

 

[IKD]

#ModSquad Asterina’s are a fairly common ID request on R2R. It would be nice to have a sticky thread that we can refer folks to for detailed information. Is there one that exists already?

 

[Soren]

#ModSquad Asterina’s are a fairly common ID request on R2R. It would be nice to have a sticky thread that we can refer folks to for detailed information. Is there one that exists already?

https://www.reef2reef.com/ams/guide-to-common-hitchhikers-in-reef-tanks.861/