The title is just for fun but removing the mantis shrimp has been painful and without success. Thanks to the reefers here who adviced me to get rid of two Mantis shrimp piggybacker, I decided to take action.
First I did the inverted water trap. Failed. I bought this trap from a LFS. (See picture.) Tried it in the tank. Failed. Thankfully I saw the live rock in which the shrimp was residing. I took the rock out and placed the trap in it with food. (See picture) Failed. This morning, after reading some articles, I tried to put cold freshwater. Failed. Poured non-sweet carbonated water. Faile