Don't throw the baby out with the bathwater! You paid big bucks for high quality rock with lots of life on it. Nurse the rock to health in your tank and try to deal with the particular guys you want to remove later.
Any process that produces conditions bad enough that a mantis chooses to abandon ship is very likely to damage and kill all kinds of life that you can't even see. Among these ideas are the FW
dip...the high salinity dip...
No one would ever tell you to take that brand new coral frag
you just purchased and dip it in FW
or high salinity just in case there's a bad hitch hiker hiding in it somewhere. Yet this advice seems to be mainstream when it comes to LR
...sorry to unload....I'm a LR
fanatic. It's just my opinion. I recognize that not everyone views LR
the same way. Yes...bad hitch hikers can be a real pain.