I have rainbow bubble tip anemones in mine. I drilled the back and plumbed it into my reef sump. I’m going to add a pair of clownfish when I find the right ones. I originally used it for a place to put hitch hikers from Tampa bay saltwater live rock. But my anemone kept diving, so now I put them in there when it does. I have a kessil a160 for light. You could add about anything that stays fairly small. Maybe a shrimp goby and a pistol shrimp plus a bangaii cardinal. Just gotta keep up with water changes if you want it to thrive.