Some will stretch no matter what, to me it’s simply a sign of vigor.
Adding dirt is fine, some cultivars even start growing root stumps on their stem above ground!
Make sure the dirt you add is on the dry side (to prevent fungus eating your sprouts, also called “damping off”), when you grab a handful of dirt and you make a fist, if only one drop of water comes out, that’s perfect!
Less is fine in this case.
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