I recently saw a tank where the guy had acros glued to his back glass, and I started thinking this might be an excellent way to make full use of real estate. I currently have montis glued to my overflow (I'm traveling now, but I'll get pics of them when I get home from this trip). How many of you guys glue corals to your back glass and/or overflows? What types of corals and where do you put them? What other cool ideas do you guys have for conserving/maximizing real estate? Please post pics if you have them!