What is this on rock and floating?

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amyd619

Aquarium Advice Apprentice
Joined
Jul 9, 2015
Messages
19
I have a new 36gal tank set up with only live rock. Can anyone identify what the white thing on the live rock is and the little floating feather thing at the waterline? The white thing is hard and about and inch. ImageUploadedByAquarium Advice1436752058.841947.jpgImageUploadedByAquarium Advice1436752071.959892.jpg
 
Looks like a type of sponge an apista though I'm not the best at identifying these types of things
 
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