The curled-up leaves are classic heat stress even though your canopy temps are correct. This is probably happening on the tops closest to the lights themselves, correct? Higher temps also mean lower %RH in that area and that part of the plant suffers. Keep your plants well watered and circulate air very well so that the cabinet temps are even throughout. Bend and tie the affected tops away from the lights.

SFGuerilla, you told the OP to never use tap water, and to use only distilled- this is not good advice when you don't mention that with distilled water you MUST add CalMag, and there are very few situations when a soil grower should not use his available tap water.

The 'impurities' in tap water are mainly dissolved limestone, which your plants need... unless your tap water is known to contain unusually high levels of chlorine, road salt, sulfur, or iron (these are the most common problems with tap water, but still rare for them to be bad enough that you can't use the water), go ahead and use it.

Sounds like the flush was a good idea though, and the extra holes help a lot I've found. Flushing with distilled water is effective, but don't forget to then give a watering with either distilled water + calmag and weak nutes, or tap water + weak nutes.
stinkyattic Reviewed by stinkyattic on . Leaf Edges turned upwards, heat stress indicated but temps are good. -indoor or outdoor Indoor -soil, soilless, or hydroponic Soil -Soil type/brand 50/50 mix of Promix and Fox Farms Ocean Forest -Anything you have added to the soil Rating: 5