Personally, I prefer to wait until seedlings are getting their first true leaves, then I start with a 50% strength liquid fertilizer with every other watering.
I used to use Neptune Fish/Seaweed Emulsion, but the smell gets pretty bad indoors. I now use the Vegetable formula from The Urban Farms (the Texas Tomato Food company). I start seeds in DE and up-pot to 100% coir, so my medium provides nothing on it's own.
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