I was unable to adjust the salmon in Hex. I don't have that down yet. Splitting the mesh is still beyond my abilities. I can split a simple sphere, but not a model. Some day. For now, I was able to play in UV room to move verticies around and get my textures to even out and not look stretched - as bad. Here is a test to see the scales. Before some of the scales were 3 to 5 times the size as others. Here the top scales are only 2 times. Ok for now. Suggestions on rock placement appreciated. The rocks look lined up, and not random.

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