I have a sixline with a blood red fire shrimp and they don't ever mess with each other. On the flip side, I've heard of stories of six lines going after smaller shrimps/crabs. I've since added 2 peppermint shrimps but both never survived more than 2 days. Not sure what they died of as I never saw the six line kill them. But I guess you can't eliminate that possibility.
I have 2 cleaner and 2 peppermint shrimp in with my Six Line and no problems. I have lost a lot of hermit crabs though, I find their body parts on the sand bed but I have never seen the Six Line do it.
The only problems I have heard about was when the wrasse was already established in the tank. Dropping a shrimp in the tank was like feeding the wrasse.
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