Hi, i have a 72g bow-front with 2 clowns, and a banggaii cardinal, and a Two Spot Goby. can i add a Wheeler's Shrimp Goby? or the two gobys will fight? and maybe later in a few months add a diamond goby. or is too much? but what i really want to have is the Two Spot Goby and the Wheeler's Shrimp Goby. can i have it together?