Asterina or something else?

[Homestarmy]

I'm currently cycling a mixture of live and dry rock to add to my display tank; after a year + I'm beginning to think I need some more live filtration. Currently, there's nothing but Marco rock in the tank.

As I was measuring the chems today, I notice the guy in the picture hanging out on the glass but I'm not sure what it is. I looked through the pinned guide, and it kind of looks like an Asterina starfish, but it only has four arms which I guess isn't out of the ordinary. is that what I'm looking at here?

Thanks for any and all input!

 

[TangerineSpeedo]

Yes it is, the other arm is now another Asterina, that's how it replicates.

 

[Kingsley_Reef]

Yes it is, the other arm is now another Asterina, that's how it replicates.

yup

 

[Homestarmy]

Yes it is, the other arm is now another Asterina, that's how it replicates.

Well, I guess that’s awesome if I’m looking to house a Harlequin Shrimp, eventually. What’s the consensus a pest or guest?