I had a couple of fake plants in my cichla tank. I took the bottom off the fake plant and silicone suction cups to the bottom and stuck them at the top/in the back of the tank. During feeding, they would "hit" the food so hard it would de-suction cup the fake plant.
As for color, I think adding green plants would add more green to the cichla. As the light/s hit the plant, it will/would reflect on the fish as well.
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