Lights

You can lower the light as far as your plant will handle it as far as nutrients you can start feeding then after 14 days from sprout or first sign of deficiency. Feed lightly and don’t overwater and you should be fine 👌🏾Hope that helps ✌️🏾

Are the cotyledons fading? (first little non-serrated leaves)... if so, you can safely start to feed...if in soil, start diluted a bit and observe and react from there. Lights control internodal spacing. if spacing is healthy or what you want, keep the status quo. If it's stretching, provide more intense light -- slowly 2-4" at a time at most.. observe and react. Or, reverse if it is too much light (not the case in your context, but future refrence)