I just got my 10-gallon nano tank and was wondering if I could put a watchman goby + pistol shrimp pair. If I can't do watchman goby, could I switch it with a Randall goby? Also, I was wondering if I could put more than the goby and pistol shrimp. I was thinking I could put one of these fish, neon goby, clown goby, firefish, pair of clownfish, royal gramma, banji cardinal, or a pajama cardinal.