unknown coral need to help to id

looks like a sponge, hope you didn't expose it to air.

Looks like a sponge, did you ask the seller what it was? Why not?

definately a sponge

the seller had a red tree coral id on it and said it was a coral not a sponge

so far is doing well i did not expose it to air now sponges supose to have a water entrance and exit for food filtering