Really depends on what you use for medium. Promix bx contains fertilizer already as do some others
For myself I use jiffy or similar sterile seedling mix and sometimes expandable pellets for certain things. They don’t contain fertilizer.
Then once growing I pot up at 2-4 leaf stage to something like promix HP which does not contain fertilizer.
If I used bx I would not add fertilizer at that point. But since I use HP I use
Balanced soluble 1/2 strength weekly until plant out and then switch to a 6-12-12 granular tomato fertilizer.
A million ways to do it, that’s what I do currently.
KarenO
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