After a second look, I think one of the things that makes this look so good is the depth of your aquarium. The "Smashed Cube" as you call it adds so much depth to your Biotope it is ridiculous! Your aquarium and Mr. Rain Cloud's are giving me lots of Ideas for my new tank
The tank and fish look great. I have two smashed cube tanks myself and I love them for smaller fish. Big fish do need the length but you really can make some pretty cool scapes with the cube tanks. They also take up much less room which just means more room for other tanks!