I'd wait on liming the soil till the water ph and runoff is known. It might take the ph further out of range. Limestone dust (lime) has a ph of around 8.

Do you use Superthrive, or are you adding any micronute formula's? (CalMag, B-1, Botanicare Sweet, molasses, ...)
Rusty Trichome Reviewed by Rusty Trichome on . Leaves Curling and a Bit Leathery My first indoor grow and the 4 week old plant's leaves don't look good. The first few sets of leaves were turning yellow and brown. As soon as I had more leaves I removed the first ones. I notices a few gnats so sprayed the remaining leaves and soil once with SchultzGarden Safe/ Fruit & Vegetable InsectKiller. Now the yellow/brown symptoms are gone but the leaves now are curling and look a bit leathery. Here is my questionnaire and I will add more photos in another post. I have been lurking on Rating: 5