My tank is a 16 G cube, and I want to avoid having a giant pile of rock right in the middle of the cube, so the fish will be behind the rockwork 50% of the time.
Is it advisable to create a rock wall, by cutting each dry rock piece into two halves and cementing several halves together, each piece being stacked on the top of the other?
The wall would then be made to lean against the back glass of the tank. The weight would be supported by the bottom of the tank though.
I'm afraid the tiny cavity wall between the back glass and the rock wall might get dirty over time and become a source of nitrates.
My idea would be to achieve something looking like the image below, using CaribSea Life Rock. Obviously my tank is much smaller than the one in the image.