Last week a friend got a small piece of drift-wood lying on a beach. After a week or so, I emersed it in a bucket of water for cleaning. I saw some movement from it, and I noted a small colony of "oyster-like" organisms incuding their shells in small houses made of calcium-like material, all attached to the wood. The houses are such that the small animals cannot come out of them, at least for now as their shells are locked inside the houses.
My friend wasn't aware that he was carrying something live with him. Now since the wood is with me, please let me know if placing that drift-wood as it is will cause any harm to my aquarium or to the oysters?
Those animals look pretty sturdy, as they are alive even after storing the driftwood in the dry for initial few days before I took it up for cleaning.