Newbie .. potting soil amount question

So I am using 3 gallon smart pots in a 4x4 grow tent. While planting the seedlings my friend suggested not using all of the medium in this process and adding it after a few weeks . Is this common? I have not seen any topics on this so I’m asking here thanks

I apologize in advance the pic that’s attached is the one from my other tent however the amount of soil is the same .

Fill the pot to about 3" below the rim. This will give you space to add soil if needed and leave plenty of room for roots.

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And if you didn’t already, it’s good to mix in perlite to help with drainage and oxygen to the roots

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Thanks guys for medium I’m using Mother Nature coco perlite and fox farm ocean forest . It’s an even mix of the 2