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The slate looks a little awkward right now, at least the 2 pieces that you mostly see the narrow edge of toward the left. I don't know if you really need them as the moss covered rocks were looking quite good on their own.
Have you thought about getting plants with smaller leaves? A nice stand of Rotala rotundifolia or Rotala green would provide plenty of cover for your betta but would be more in proportion with the size of your tank. Some other good plants are Hemianthus micranthemoides, Ludwigia arcuata (leaves are a bit longer but very narrow), and I think Anubias nana petite would provide some nice contrast without getting too big.
Have you thought about getting plants with smaller leaves? A nice stand of Rotala rotundifolia or Rotala green would provide plenty of cover for your betta but would be more in proportion with the size of your tank. Some other good plants are Hemianthus micranthemoides, Ludwigia arcuata (leaves are a bit longer but very narrow), and I think Anubias nana petite would provide some nice contrast without getting too big.