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I prefer the more natural look with piles and piles of rocks, but if you have enough hiding spots and lots of blocking of line of sight then this really helps ease aggression.
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I would do lots and lots more hiding spots. On a 55g tank you are going to need approximately 12 ish fish for normal stocking. Each of those fish should have a cave.
Acrylic Black Paint for the background would be good as well and really make your fish's color pop, but if you have the budget to go with a 3D background, it's definitely the way to go.