please help

I got Rqs Northern Light fem plants, they are in veg for about 35 day and leafes are starting to turn yellow. They were feed with fish mix 2 times last week and yesterday... I tought its nitrogen problem but im dont know now please help.

I don't think you need so much fish fert.

they don't look burnt. Do you ph your water? what kind of soil is that? what kind of light? how high is the light? what nutrient do you use?

oh yeah and what size pot

Whater is 6,4-6,5 PH 400w hps 20l pots and soil is Plantella balkonia 200-500 mg/l N, 200-500 mg/l P, 300-100mg/l K,100-200mg/l mgO...
I didnt have ph meter from day one, i have it last 20days

I only used fish mix nothing else

I'm not sure what fish mix is but I bet that is your problem. If you want to stay cheap, get a bottle of age old grow online. it's like 10 bucks and it is bad ass. If you get it only use it at 1/4 the dose that it says on the bottle to start out

make sure you are not over watering. let the soil dry out real good before you water. should take about 4 to 5 days in that 5 gallon, maybe longer.

Fis mix is organic fertilizer by bio bizz with npk ratio 6,4,2 for veg growth