Tank looks nice. Well done. I really like the driftwood piece!
+1 on the driftwood issue. Totally normal, just let it runs its course and it'll go away. My shrimp and fish would actually pick at it too. I have no experience with pressurized CO2, so I have no help for your second concern. But an idea/suggestion, what if you moved those 4 river stones you have on the white gravel and either centrally arrange them, or scatter them about where the white meets the black. Just an idea.
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