ID Help Please

[smkkib]

Recently i bought a rock with some zoanthus. yesterday i found some kind of tentacles come out from there.

My suspect is a sea apple, i read they are bad for the tank as they kill tanks.

Is it a sea apple?

Thanks

 

[Sugar Magnolia]

Jard to tell from my phone. It could be a rock dwelling cucumber, harmless filter feeders.

 

[rssjsb]

Agree. I doubt very much that it's a sea apple. I've got three similar looking caribbean filter-feeding cucumbers attached to rocks and corals in my tank. I love them.