Tiny starfish appearing out of nowhere

So I got some live rock that was cured (or so I think) and added to my tank last night. As of now, not even 24 hours have pasted and I've gotten a dozen new cleaning snails (thankfully) and a bunch of star fish. I have 7 on my tank right now, can someone help identify them? Are they reef safe? Will they be ok in my tank? All I know is there are at least 7 in my tank because that's all I see on the tank glass. There could be more for all I know. Thanks!