To me all looks well, but photos can be deceiving.

@ 7 days from seedling I would be adding a dilute rooting hormone like HygroZyme or Voodoo juice just to try and get a good root structure in time for when I'd apply a mild feed. Must have some form of well developed root structure developing before the application of nutes. The roots will then be ready to take up the food right away when feeding commences.

I would continue under 250W but at a distance of 24inches maybe; until i start feeding, then I'd lower the lamp to around 12-18inches.

I would expect to see some reddening on the stems until I start feeding; probably after 10-14 days.

My recent clones were quite red when they arrived. I know that the clone merchant only applies a root hormone to the clones. But after one day of a mild feed at 0.8-1.0EC the reddening has started to go away. (I always look at it as potassium deficiency and potassium silicate is what I use to fix it).