First grow, project in quarentine

Greetings from Canada. I would say it may be both the light (13 inch is a bit close even for LED) and nutes different plants stains react different to nutes ( what may be good for one may not be so good for the other) I would also flush out the plant with at least 18L of water (that should get it nice and low ppm's) and then start with the nutes again. In my grows I put 2L of water 10 min before I add 3L of nutes and I have never had a problem since. On a side note you should add micro to your 3 part as it should be micro + grow + bloom then any other nutes you want to add.