yes, toss it. If it is mold, you do not want those spores to go anywhere else
you should expect some of the leaves to give up their life for the flowers. Fall usually has this affect on plants as they get closer to maturity (harvest time). If the TOPS are ok looking, ignore. The leaves show deficiencies like Magnesium. Do you use or have cal/mag?
In soil, i would add dolomite lime (the finer the easier it gets to the plant. In water, lime is not really water soluble.
Magnesium helps and if you have epson salts (plain) 1 teaspoon for a GALLON of water and SPRAY, do not put in the reservoir
Blackstrap molasses contains both calcium and magnesium and you can add a few DROPS to the reservoir
I almost forgot…root-rot, which happens much more in hydro than soil / mixtures makes leaves turn yellow
Often plants will have a few yellow leaves by harvest time! This is completely normal and nothing to worry about
Holy cow! About a yard of soil in there, bet those roots were wild!
I took all the leaves that started to turn colors and I trimmed the larger fan leaves to keep her open.
Looks pretty in the sun. You can purchase grow lights. I have an inexpensive one over my pot. I plan on getting a better bigger one once I set up my own hydro system. You can use a fan for air circulation which is one thing I keep forgetting to do
I do have cal/mag and just put some extra in. Thank you for telling me that it can be a normal thing for the leaves to turn. The flowers look real good, I was just worried about her not getting the nutes she needed