Leaf tips yellowing and curling down

Hello ,

Im growing LaDiva it is the end of 3rd week from seed and top youngest leaf start to yellow and curling down im only watering without nutritions.Please help me.

how often are you watering? whats your medium? lights? got good ventilztion? and air movement? ...no nutes? ph?

Im watering with water ph6.5 two time per week when soil is almost dry with 1lit per 9 lit pot of plagron growmix soil pH: 5,8 and 6,2.
EC: 1.4 and 1.6. Soil is good with nutritions for first 3weeks.Temp in room is 20-21 celsius and humidity 50-55%

cool man, didnt want to offend ya or anything, but alot of peopke here have problems that are a very basic fix...anywho, im not sure whats up with your ladies, but ill be here to help out, or add any input as we go. lets figure this shit out!...i can only think of a possible deficiency at this point...cal mag? i knkw its kinda early, but not completely unheard of at this point...

possible N?

If N older leaf start yellowing first in my case only new toppest leaf are yellowing.I had heat issue before leaf were curling down i raised lights and fix that ,was ok for one week now i got second problem leaf curling down and yellowing ,could be overwatering 1lw on 9l soil or maybe needs more food or ph problem im testing water with some simple test not digital ,but order it yesterday hope it arrives soon .

Its cal/mag def.Its cause u dont feed her any micro and mycro nuts....Use veg nuts like 20-20-20 or .....(npk)and how can u talk about your ec of u didnt feed her?!?

neved said:

Its cal/mag def.Its cause u dont feed her any micro and mycro nuts....Use veg nuts like 20-20-20 or .....(npk)and how can u talk about your ec of u didnt feed her?!?

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Yes could be ,because the soil comes already optimized with correct ph and nutritions for first 3 weeks.I do not know if I should start feed her with veg or grow nutritions she start to show signs of flower 15th day from sprout.

Could you be more specific about 20-20-20 ,what did you mean by this ?

I have BioBizz Bio-Grow and Bloom.

possibly boron as well...most likely cal mag.

Should i flush with water from pipe ,is ok ?

And give growing nutritions ?