Possible Pest

[Tracey]

What would eat/kill sps, acans, chalice but not bother elegance or hammer?

 

[KJ]

Any pic?

 

[ChronicReefH2o]

One thing that would kill acros or SPS are Acropora eating flatworms. Bristle worms won't kill corals, but can irritate them to a point where they won't open up which could lead to death down the road.