Pistol shrimp question

I only have one pair, but when i did reasearch on them i did read that you can keep 2 pistol shrimps together. It said usually one will hang out in the entrance while the other does the digging. My brother in law has a pink spotted goby about 3 1/2" and a diamond goby about 2 inches in a 120 and they do fine. In my opinion it should be enough room for 4 of them. My $.02!
 
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