So I started out with a 10G and quickly realized that was to small for my tastes, so I just picked up a JBJ 30G Cube. I'm trying to hold back my enthusiasm and go slow and build right the first time. Anyway this is my latest attempt, and I want to see if any of you would have some do's or don'ts with this rock setup. For reference the box top where the flaps fold is pretty much dead on for the water line in the tank. The sides of the box are 1.5" in from what the actual inside glass of the tank would be. IOW if the rock is touching the cardboard there is still space. The black line across the bottom is the front glass.