If you are headache will all those rules... you can always google the word "iwagumi" and you will get plenty of pictures to choose from. Just copy one of the Amano work . Alternatively if you are adventurous, you can create from your own idea.
Aquascaping is an art, there is no right or wrong. Just do as your hearth tell you, as Vincent said "You'll be the one staring at it when you're at home."
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