I think you did a nice job. I have the same tank. If your looking for feedback one thing I noticed (kinda a nitpick) depending on how into this you are, that the main rock on the right is not angular like the ones on the left. It looks more like a dome shape (unless it's the pic). You also have smaller rocks around it's base and on the left all rocks are blended better with the substrate. The arrangement looks more natural on the left.
I would move the main rock on the right into the substrate more and have a more angular side pointed toward the group on the left without the smaller rocks right up against it. Just the way I see it, otherwise very nice.
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