I don't drink coffee so I'm just crazy!
But to actually address what you wrote...you are right and I just claim artistic license for my choices. I will explain a little.
While I know there are nicer tanks, this is the one I had and didn't want to purchase a new one so I went with it.
I hated the filter inside the tank, it was driving me nuts! I was so happy to get rid of it.
The dwarf hair grass was planted in such a way as to resemble terrestrial grass that grows up around a rock. This is a bit of an Arizona flair as this is a common sight in the deserts where few plants grow well. Grass tends to grow around rocks as they provide shade and moisture in the arid climate. I wanted that particular look around the rocks. It is meant to convey the illusion they have been sitting there for quite some time.
Sort of like this...
There are three stones.
The notion is that the oyaishi is weak, or weeping. It has been resting in the grass and is attempting to arise. The fukuishi is supporting it in the hour of need. The fukuishi is using the drift wood to brace himself against. All this while the soeishi has fallen at its feet unable to cope. I used more plants with the intention of closing in this scene as if the viewer were seeing something private and that it was happening in the shelter of a tree.
The dwarf baby tears are like a soft bed the ailing oyaishi was resting on before he tried to arise.
The three moss balls represent the spirits of the three stones released from the pain and care they are under. I wanted something round to literally represent a separate sphere of existence.
So, rather than use the golden ratio or rule of thirds (or two thirds if you rather) I chose to symbolize a particular scene that might be toward the end of the Oyaishi's life if it were living.
Take your meds...