I used Espoma Plant Tone last year in mine, and that's a 5-3-3. Worked fine for me.
It was my first year using earthboxes, and I did not use them to grow tomatoes, but the kale, pole beans, bush beans, and peppers did extremely well.
I did give them a little extra Texas Tomato Food every couple of weeks down the watering tube. (Even my banana tree loves Texas Tomato Food!)
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