How many citron gobys in a 29 gallon

I am running a 29 gallon biocube. I have 2 baby clowns a pair of watchman gobys and one green citron goby.

My question is can I add another yellow citron goby? I love these fish and want a few of them but I don't want them to fight. Anyone else have a couple in a small tank?

Thanks
 
It's a different kind. This goby is the same one that's already inside my tank but green. I was thinking of getting one in yello now.
 
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