O man, I think that is really cool about your firefish moving in with the YWG. It's more unique than the goby pistol shrimp pair??? In my 25 years of marine fish I have never heard of that and I maintained tank accounts for a LFS and have seen a lot of tanks.
Just choose a different goby( yasha or prawn goby) to go with a pistol shrimp.
Just choose a different goby( yasha or prawn goby) to go with a pistol shrimp.