So I have 300dd. Still kind of dirty so please excuse the mess ! Anyway working on some ideas. I know there are a lot of extreme minimalist and while I do appreciate its style I am going for a more full look (but obviously not the rock "wall" effect either). It is a very deep tank, there is about 2 inches on the back that don't touch the wall and about 1-2 inches between the side walls and the rock (Mostly 2 - one spot is closer to 1 but i may trim off that piece.). Any thoughts here Will update my main "DIY" project one here soon. Please note I plan on putting around 2 inches of sand in the bottom of it.