I have kept multiple pairs before. You have a very peaceful shrimp goby pair right now so you will need either another yasha candy pair or a high fin candy pair. Whatever you do don't add a watchmen they get big and aggressive and will not treat your yasha well.
I think you should be okay, especially if you follow the advice of Gill bucket above. I have two watchmen paired with a tiger pistol shrimp in my 4ft tank and they never leave the far left side of the rock structure so with some planning when introducing another pair in your tank I don't think you'll have any problems.
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