I have a smasher type mantis in my tank. It came in on some gulf live rock. Its been in the tank for over a year now. I tried to catch it once, and tore my whole aquascape up, but I just gave up. Its never bothered fish, but does eat cuc. But I dont really mind that, because I have a melanurus wrasse and a flame hawk, and they both snack on the cuc from time to time also. I just restock the cuc when needed. I see my mantis every now and then, he digs out big burrows under the rocks, and then I hear it popping really loud sometimes. I just live with it.
pics if you’re able to please!! ;Woot