Before thinking of transplanting I check the roots. My seedlings either grow on flats or in yoghurt pots with a hole punched in the bottom, wide enough to enable me to push the the whole content out without breaking the mix and thus check the importance of roots. If they don't show at all or just a little I wait. The same rule works if there are several seedlings in one pot. The more I (resonably) wait, the stronger seedlings get. I use liquid fertilizers, but never more than a third of the recommended dose !
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