I had a coupleof anemone for a bit, Condylactis gigantea.
My G. ternatensis i,,ediately attacked one, resulting in it's eventual demise, some four days later.
The other one I added in with my G. platysoma for a week or two, then moved it in with one of my O. scyllarus (Peacocks). It died suddenly , after a month or month and a half.
The mantis ignored them (Except for the tern, but she attacks Everything that enters her tank) for the most part.
-Ron