Here are the photos of my attempted 180 L tank design. It never got finished due to two reasons:
a) Half way through the first attempt glass cleaner got accidentally sprayed onto the inside of the tank. This meant starting over, with new gravel.
b) After the second attempt, in which I used sand, everything looked really bad. And it became clear that I took the hobby a bit too far for the missus, and I agreed to take the tank down and stick to my old 100 L one.
Still think a few useful things were tried and I took photos, so here goes:
1. I started by making some preliminary rock formations outside, without my tank. As you can see I used masking tape to define the major areas of the design. This worked okay, but it lacked the height of the gravel underneath. I don't think I'll use this method again.
2. The tank with black backing, before anything was added.
3. Using cardboard and tape I made sections in the tank in order to use two types of gravel.
4. First I made a layer of aquarium peat, about 1cm high, in the areas where I wanted to grow plants.
5. Then gravel was thoroughly washed and I found this jute bag extremely handy, so here's a pic:
6. In goes the gravel.
7. I finished the rock layout inside the tank and added the driftwood. This was way easier than doing it outside of the tank, as the height of the gravel and tank walls really need to be there.
8. Time for the bamboo and the hoses, bamboo which I later decided not to use because it became really moldy where it was sticking out of the water. This apparently is normal. But for those interested, some pics:
9. Now I started tying Java Moss to small rocks to put on the dividing line between the two types of gravel and in between the larger rocks. At this point in time glass cleaner was sprayed into the tank accidentally. So this whole design was taken apart, new gravel and sand was bought and I tried again. But this last design failed, because the sand sank when water was added and made the water really cloudy. So it resulted in this:
10. At this point, in accordance with the missus, I dismantled the tank. It was too big for our space, and now it looked completely bad. It's all good practise though 8)
11. I redesigned my old 100L tank. Took the driftwood out, used stones, added plants. Balance had returned to our living room once more. The end.