I've got two cleaner shrimp in my 67g. Most of the time, they're together under a ledge at the back of the tank. They do come out at feeding time when they swim all over trying to grab a mysis or two. I also see them on occasion away from their ledge, but not very often. Don't think they are a mated pair, though, but I guess they could be.
You might do a search on RC for mated cleaner shrimp for more information on what they do with their eggs and such.
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