My first mantis I ever had lived secretly in my tank for four years before I noticed him. As soon as I learned what he was I got all panicked and got him out.
Now, I have another one. This time, I'm less inclined to remove him because he is an entertaining little fellow and he hasn't done anything wrong. I'm not willing to hand him a death sentence for something he might do someday.
I'm convinced that my LR
is healthier for NOT dipping it. Anything that causes mantis shrimp to abandon ship can't be good for the millions of other things that are alive on the rock. That's what you paid for...don't kill it.
If you really need to get the mantis later, you can.