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its a leather i believe... i have something very similar to it... one sec leme find the thread
Edit:
here it is
https://www.reef2reef.com/threads/type-of-leather-or-a-sponge.294857/
thats what mine looked like when I touched it... ill add that the lighting was a lot better in the first picture then the others... First photo was from my old tank that I took down and the photos I posted of it opened was in the new tank... i liked it so much that I moved it over.
It's been a few weeks now and its over tripled in size... it loves med/high flow and med/high light...
Wow cool, looks cool, how hard was it to get off the rock? Did you have to glue it onto another rock?



