does anyone know why my bottom leaves are yellowing/browning and cracking? The rest of the plant seems healthy
Probably nitrogen deficiency, but can't be certain with those purple lights. Need a pic in natural light with flash to be 100% sure.
The even paling/yellowing of the bottom leaves is usually a sign of nitrogen deficiency. The black/purple leaf looks like something else is going on there. Hard to tell with pics looking a bit dark.