Athosanswered grow question 6 years ago First, increase the distance to the bulbs, seedlings are very sensitive to the heat put out by HID bulbs.
Second, stop all feeding, 11 liter (3 gallon) of soil should last you for several weeks without needing additional nutrients. Wait until you see the first signs of deficiency before adding any more. You probably have 8 weeks before you'll need to add nutes.
Third, I know Biobizz says not to, but bring your pH down to the correct range of 6 to 7 (6.5 is ideal), it does help. Actually I've had leaves curling up like yours due to high pH.