Hey all. I've got a Cobalt Aquatics C-Vue 18 set up and it's had a pair of ocellaris clowns in it for a bit over a year. Aside from some zoas and an ungodly amount of ceriths that keep breeding I don't have any other livestock. I'm wanting to potentially add another fish, but I'm not set on it. I'm thinking maybe a shrimp/goby pair? Maybe just a goby? Sand bed is 1.25-1.5 inches deep. I'm not necessarily married to the idea of a goby, but I figured that would have a pretty good chance of not getting picked on too bad by the clowns. I definitely want to try for captive bred /sustainably caught live stock. Super open to suggestions. Any ideas?
Pics of tank for some context
Pics of tank for some context