My sarchophyton has a hole in it.:bugout: What's up with that. It seems healthy otherwise....extended polyps, good color, has been growing well. Should I be concerned?:bouncebox
I've seen this a couple of times with freshly imported Sarcophyton spp.
It is caused by a worm living inside the coral. In the cases I know of, it caused no long term damage and actually the worms disappeared after some time in aquarium.