Not that I know anything about this but,
had a pair of cleaners and one fire shrimp for many years. Recently one cleaner took the big dirt nap in the sand bed so I replaced it with a smaller one. Only seen the new shrimp for a few minutes.

Just my observation, but I started with two yellow cleaners, lost one. Bout three months later replced it with a pair of visable smaller shrimp, one didnt make it the other bonded with the first shrimp - became new group. Recently I added two more smaller shrimpa nd other than they set up on the opposite side of the tank. I havent noticed any ill effects from the first two. Now I have a cleaning station set up at both ends of the reef and my fire shrimp hang out kindof in the middle. All 6 shrimp dont seem to bother each other and just do their own thing. Also have a roup of 8 sexy that took over a top corner, but again no problems so far (knocking on wood).

i'd like to get a large group of them one day