Actually, they can be really fascinating. In particular, the combination of a Randall's goby and a tiger pistol shrimp is very, very cool. Give the shrimp lots of building materials (like crushed shells, pea-sized rubble, etc) and have fun watching.
I can post a video of my tiger pistol shrimp and yellow watchman goby. Actually the watchman has vanished, I think it either got caught in a landslide or got eaten by my scorpionfish; my intent is to replace it with a Randall's goby when the LFS gets one.
The (smaller) combination of a Yasha Hase goby with Randall's pistol shrimp is fun as well.
Basically "it's all good". Just don't try to combine the mantis and the pistol!
Dan
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