I'm using distill'd water , and I know they are not nutrient burned because I feed them no food.
My soil is Sta-Green , doesnt' have enough nutrients in it to cause a major burn like that.
Any time someone see's a plant problem , its always nutrient burn thye think.
over watering looks like to me also.
How often you watering ?
The reason most ppl say over feeding/watering alot is, it's one of the most common problems for new growers (and you have the signs).
I found pics simliar to my plant , and if anything , it may be lack of nutrients.
So I jus started yesterday by adding miracle-grow plant food in my water , feeding it now every 2 weeks.
Yeah , Im gonna try this miracle-grow plant food , has every nutrient needed.
I have been watering it with a half-gallon of water every 4-5 days , im gonna cut back on the water.
A guy told me with a 10 inch pot , use a half gallon , but i think thats a bit much .
nitrogen , phosphorus , potash , trace elements deficiency , ur plant is simply hungry , feed with an allaround fertilizer , clean the plant material fallen to the soil