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Tough call, can you provide pics?
Shortness can be a good thing as long as you are getting leaf/side shute growth.
The pot its in is large for 3 weeks, so keep in mind it could be working on roots also.
Plenty of light for now it sounds like, are they the proper K temp bulbs?
If you do decide to feed it, make sure you heavily dilute since they are so young.
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