help me identify

I have found more new life it looks like a white t very starfish like but lacking arms its very small and upon starting this post my gf found another looking like 4 arms i cant figure out how to post pics from phone so help with either would be great lol oh and i forgot also ive got a half shelled creature looked like a fossilized shell on live rock but then started movin ive got pics of both bit habent been able to post yet

 

well pictures would definitely help but the "starfish" if it is very very small it is most likely just food for the fish in your tank and is normal, but again pictures would be great haha

 

Look under Asterina on this link.

Starfish Hitch Hikers
http://www.chucksaddiction.com/hitchhikers.html

 

as you would say (yup)

 

yup.

Also look at Stomatella for second ID.

 

Thanks thats exactly what they are i seen pics of both on that link any hints on fossilized lookin jalf shell creature