I would not feel embarrassed if I were you. Every tank is different in many ways including differing bio life. Maybe since this tank is so large and you starting it with dry rock it just hasn't had time to create as much or as diversified bio life as you have had in the past. Who knows, on down the road you can experiment with an SPS piece or two and see how they do. Anyway, enjoy what the tank has to offer for now. Its a beautiful display of ocean reef beauty!