In nature, plant coverage follows the light, I think your grasses would have done better in the bright spot right under the light.... maybe it is something you could work with.
I suspect you will see wore growth towards the center than on the one in the corner.
Your botias will enjoy 2 or 3 large leaves on the bottom for cover. I find aged oak leaves, picked up from the ground work well.
Cape Town, South Africa.
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