Although not trying to put personality to cleaner shrimp one of mine did. I have two cleaner shrimp in my 20L and I tried adding 2 peppermint. I watched over them for a few minutes. My cleaner shrimp are described as: one docile, shy, the other mean, aggressive, bold. So the shy shrimp stayed to itself, while Boldy came over to check out the peppermint. I watched and he just tapped on it with his antennae and did nothing more.... until I turned my back. I went back to my desk to work and about 5 minutes later turned to see it chasing a very petrified peppermint. I snatched the peppermint by hand, and it was more than willing to jump into my hand at that point and I put it in my 12g where I had another peppermint. The 2nd peppermint in the 20L became dinner as I never saw it again.