pH is 8.4. how much peat moss to add?

Soil pH – Black Gold

My pH won't drop no matter how much pH decrease I add! When I put a drop into the test tube it works tho? Won't change in my tank for anything.

Coconut coir bricks are composed of three different types of compressed coconut coir. This 1.4lb (650g), high quality, low sodium, sterile growing medium is an alternative to sphagnum peat Moss & absorbs great amounts of water, lowering watering frequency. When hydrated with water, bricks & blocks rapidly expand which saves you time & effort. They can be exclusively used by themselves, blended together or mixed with expanded clay pellets, perlite or topsoil.

Viagrow VCCB650-12 Coco Coir, 12 Pack, Makes 2 Gallons / 7.5 Liters / 8 Quarts, 650g Brick

Moisture Control 8 Quart Peat Moss Moisture Control

Miracle-Gro Moisture Control 8 Quart Peat Moss Moisture Control

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8 Quarts of Natural Peat Moss - No Additives 100% Pure : Soil And Soil Amendments : Patio, Lawn & Garden

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Peat Moss to lower soil Ph