I can't tell if that is the light or your plants are a bit pale (=hungry).

The leaf-edge problem is caused by having high heat compared to your humidity. While your room temps look perfect, your canopy temps may be slightly higher, and your humidity is on the low side. Raising the light, adjusting your watering schedule, and increasing the relative humidity to about 40% should help a lot.

Otherwise, you have some nice healthy plants there.