Get ready for your tank to start cycling all over again. And again each time you have to do this when more "bad" critters appear. Only wy you will kill off everything is to boil it all. Then the corraline will bleach white.
Why not just go buy dead coral skeletons and crushed coral? Much easier. Same result.
that way each week you can take them out. bleach them again and control the "pests".
If you have LR in the tank you
ARE going to have critters.