Soil Mix - If my PH is 6, should I still add Oyster Shell grounds?

Maersk

Active Member
My current organic only mix is

30/30/30 EWC, Perlite, Peat.

Bonemeal
Seaweed granules
Alfalfa Pellets
Rock Dust

I guess I will gain some Calcium from the Oyster Shells, but as I believe they are mostly used for PH issues, is there any need to add it?

Originally was going to add 1 cup Oyster Shells per 1cf soil
 
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