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Just a quick thank you to Jo for the large selection of moss she sent me. It was way more than I was expecting -Thank you Jo Much appreciated.

? Where is that face palm icon? Yeah, no idea how much is necessary. Add and test. Just remember, the substrate, leaves, etc will all fight to reduce pH. So it is not going to be a 'set one and forget' kinda thing.

Thank you so much for the warm welcome. Im new in this hobby and still have many things to learn.

That's not much of a change. So a small handful of coral chips in a sock/stocking at the top of your filter (or sump) would be the best way of doing it. You will need to adjust the amount of coral depending on the size of your tank. With such a small change 6.2 --> 6.5, you could even start dosing some Potassium carbonate to increase pH, and that has the added benefit of introducing a major mineral that is used by both plants and shrimp.