Hi buddy, first of all amazing grow so far :)
Flushing your plants after observing nitrogen toxicity was a good step to help correct the issue. Here's what you can do next:
1. Monitor Plant Response: After flushing, closely observe your plants for any improvements in their overall health and leaf color. Nitrogen toxicity symptoms should start to subside as excess nitrogen is leached from the soil.
2. Check Runoff: When you watered with plain water, did you measure the pH and EC (electrical conductivity) of the runoff? This can give you an idea of the nutrient levels in the soil.
3. Nutrient Adjustment: After flushing, you might need to adjust your feeding regimen. Gradually reintroduce a balanced nutrient solution with a lower nitrogen concentration. Monitor your plants' response and adjust nutrient strength as needed.
4. pH Monitoring: Continue to monitor the pH of the soil and runoff. Maintaining the proper pH range (around 6.0-6.5 for soil) helps ensure nutrient availability and prevents nutrient lockout.
5. Recovery Time: It might take some time for your plants to fully recover from the nitrogen toxicity. Be patient and give them the opportunity to bounce back. New growth should appear healthier.
6. Leaf Trimming: If you have severely affected leaves, you can consider gently removing them. This helps the plant direct its energy towards new growth.
7. Avoid Overreacting: While you've taken appropriate steps to address the issue, avoid overreacting and making sudden changes. Gradual adjustments are generally more beneficial for the plants.
8. Regular Care: Continue providing proper care in terms of lighting, humidity, and watering practices. Healthy plants are better equipped to recover.
9. Observation: Keep an eye on your plants daily. If you notice any new symptoms or changes, adjust your approach accordingly.
Remember that recovery from nitrogen toxicity takes time, and the plants might not show immediate results. Continue to provide a balanced environment and nutrient regimen, and your plants should gradually improve.
If you have any further questions feel free to drop me a DM :)
Good luck and all the best