So I am doing my first grow right now, I have 2 babies, one is Blue Dream and the other is AK-47 I think.
I am growing indoor, using high output T5 flouros, Sunshine #4 is my medium. The Blue Dream is 8" tall now and the AK is about 14" tall. I got them as clones 3 weeks ago and they have grown about an inch each.
This week some of the lower, bigger leaves started turning yellow and then the tips and serrated edges of the leaves were turning black-dark brown. Even the new leaves growing at the top of the plant have dark on the edges.
I haven't added any nutes and the water I use is bought from a water store and has a ph of 8.47 according to the store.
Any help would be greatly appreciated, I want to save my babies.