Started putting her in darkness for just over 12 hrs a day, as the days are still pretty long here right now. No new techniques or feed, will remain the same until flushing.
Leafs are fragile. Excess air movement and friction, or any abrasion of the plant to even itself, can result in that. Nothing to sweat, you’re all good. Healthy looking seedling. You’ll be fine, keep up whatever you’re doing.
Cheers