Still using bottled water and using fox farms schedule. Some leave ends are dying , and some leaves are rusting like. I give some epsom salt to the gsc every 3rd watering . The white widow i have only used water. I cut two of the tops going to let the rest stay for a little bit longer . The biggest one was 44 grams
Looks to me like nitrogen toxicity. In the early stages at least as I can see your leaf tips are slightly burned.
Best bet would be to flush your medium before anything worsens and just start over with some nutrients at less than half strength. Can’t really go wrong doing that. I’d also say switch your light cycle as plants without a dark period are more prone to getting sick and bumping into problems. 18/6 for a little while may help and work wonders for you just until she’s stable again. If you think you’ve over watered all you’d have to do is wait for the medium to be dry before next watering. Hope this helps