Anybody know what these are?

[r33fertank]

They look like little star fish with uneven length legs and a red dot in the middle of them.

 

[FLAdaboy]

Asterina starfish. Harmless but can get out of control quickly.

 

[jenreefer]

astrina stars. they are ok in tank mostly but can become pest as they reproduce well. There is one kind that will eat corals, but the white ones I think are ok

 

[r33fertank]

Ok, Thankyou. Il make sure they are not the ones that eat corals and watch they don't get outta control.

 

[FLAdaboy]

Ok, Thankyou. Il make sure they are not the ones that eat corals and watch they don't get outta control.

Harlequin shrimp

 

[Reef_Collector28]

I hate these little stars. They spread in my tank in the hundreds and really got out of control. They say they are "harmless" but I would say other wise. I've seen them eat corals, couldn't add a harlequin shrimp in my case because of three wrasses that I had. I would take them out whenever you see them. Trust me they are no good.