rsm250;stocking list; seeking advice

Hi, Would be grateful for help with stocking. I am re-starting my RSM250, have already 3 fish: 1. Occ. clownfish (about 1.5", rather peaceful) 2. Gold-headed (sandsifting) goby (2.5-3", doing well, had it >2months) 3. Firefish (regular) (2", for about 1 month) Other livestock: 1. Large fire...