At the top of our list of non aggressive saltwater fish, are the shrimp goby (Amblyeleotris randalli) and pistol shrimp (Alpheus randalli)1. The symbiotic relationship seen between the two is very endearing and are one of the easiest to establish in your tank.
You do not need to worry about whether or not they will like to be in each others company or not, as they are predisposed to seek each other out.
Neither do they need to be introduced at the same time, which is in my experience very hard to achieve if you are looking for a specific shrimp goby and a specific pistol shrimp.
You can simply add your chosen shrimp goby, and when you find your pistol shrimp it can be added then, or visa versa. The shrimp goby has a natural instinct to associate itself with the pistol shrimp, and will do so in your tank when it realises that one has taken residence.
This can be immediate – when the shrimp goby sees the pistol shrimp being added, or it might take a while for realisation to dawn. For more information about pairing a shrimp goby and pistil shrimp click here to see our article.