For the record, zooxanthellae doesn't make for a very interesting display organism.
Seeing natural interactions between animals is one of the coolest things we can see in our tanks. That's why I like pairs/trios of fish. I've never had a goby/pistol pair but that's one I will definitely do at some point. My jawfish passed yesterday

and my firefish is looking pretty geriatric so I may have room to try.