Well let me try to give you some bad information.
Your watering too much sir by your post, and adding too much ferts. Which by fact, you KNEW it was wrong. And understand it is okay, and if damage hasnt went too far, we can try to correct the ailments.
GrowFaq, Noobcentral, whatever man.
Listen, dont water so much, the roots too wet will lead to funky syndrome. You need to let your plant take up water, yes, but you also have to let it dry as well.
Ferts. Dont overdo it. Start with small amounts, You need a small ass pinch, smaller than you think. Especially a young plant in life. A 1/4 TEASPOON at 3 weeks or so, a lil' dab'll do ya. Water with ferts, or nutes, every OTHER watering, or every 2nd or 3rd time you water not every single watering session. Follow the directions on the bottle, but add LESS than what is recommended I would say on almost anything.
First work with water only, then you may see the signs of a plant needing food. Instead of a plant needing correction.
Every room is different. I water every 3 to 4 days with straight up water from tap. I have an aquarium bubbler, and I let my water bubble for days before I use it. I see you like that RO stuff or whatever.
Let it dry out. I would say please dont try to fix with nutes, and ferts, but regain strength of plant by plain water at this point.
What we are trying to do at this point fix the soil. I believe you made your solution too strong, what we need to do is expel the garbage and return the soil to stable levels.
We have to predict whats going to happen in months, not days. We need to plan it out over time, and not everyday.
There are many different approaches to plants, my belief is water is the single most overlooked aspect of the grow itself to a new green thumb appleseed.
Temps, Lights, Lumens, Bulbs, Environment, Strains, Genetics, Soil, all this for nothing if we dont grasp the one single most important aspect of plant growth. Water.
Some keywords, PPM, EC, PH Level, Dissolved solids.