I'm planting in an indoor garden (with artificial lighting). This happens with some plants:
They "faint" and after some days dry out and die. This doesn't happens with some other plants but it happens with peppers, lettuce, arugula, basil. I don't think the trouble is the light nor nutrients in the soil (I have other plants in similar conditions thriving extremely well, mostly cucurbitaceae, tomatoes, beans, java plums, etc). Today I conjectured that it could be the heat. Do you have any idea why this happens?