I wonder if a chicks approach to aquarium's is different than guys?
You know how you can look at a picture of a room - notice all the pink poofy things and know "A chick designed this one"? Or notice the musty old moose head on the wall right over the bikini calendar and know "A guy designed this one"?
I wonder if you can look at an aquarium and know the same thing.
Anyway I quite like your arrangement. But being a 'guy', if it were me I'd arranging the rock into the most unusual shape I could.
- A tower.
- An arch.
- An upside down J shape (so there was some sort of overhand)
- A 'V' shape (skinny on the bottom and big on the top).
- High on one side - low on the other.
You could combine the ideas - say an overhang from the side of an arch. Something that says more than "Look I'm a pile of rubble". You might want to take my ideas with a grain of (ah hem) _salt_ since I wear brown shoes with blue pants, and think that white shoes and a white belt look outta sight!