Also I forgot to mention and not sure what your tank looks line in terms of landscape, but they do need a landscape with a lot of caves and crevices so they can hide, escape another invertebrate going after them and also keep in mind they become very vulnerable when molting and right after...
I have quite a bit of rock In my tank placed in a horseshoe and quite talk at the back resting on the back wall; this way they all get enough space to call home.
When the coral branded is awake, the cleaner usually goes behind and sleeps and viceversa. My peppermint is nocturnal as well and he gets chased around often but he gets away easy through the rocks since the other two have a tough time squeezing.
Now anOther thing I find weird is how did the pistol catch the shrimp as the pistol is always under or around his rocks...
In regards to the rockslide, they will cause rockslides if the rocks are not properly secured and with a very deep sandbed.
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Casual reefer
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