fish question

[polarbear]

So I currently have a pistol shrimp in my 90 gallon tank which I love. I want to buy a yashi goby to go with him but also wanted to buy another goby to help with the sand bed. Not sure if I want to get a orange or pink spoted goby. My question is, will they all be fine together? I know the yashi and shrimp will pair and the other gobies will pair with a shrimp as well. How does it work if one pairs with the shrimp and the other one tries also? Do they fight or do they share the shrimp?