My rock leaves no where for them to hide during the day, all artificial branch. I wish I could use them, they seem to be the best option. They also seem likely to be expensive snacks 🤣 My red coris is a terror, he flips a few smaller rocks that I have added to isolate zoas and such. I added a peppermint a few months ago, was killed within 10 min of the red coris waking up the next day. He has also wiped out 2 conches within a day or two of adding them. For some reason he does not go after my turbo snails 🤷🏻♂️