Help needed photos included

Hi i am having issues with my second attempt , quick rundown i had 10 seeds 9 sprouted, i was very careful about watering they only got watered 3 times as i seen needed in the first 3 weeks after potting them but on week 3 i gave a little feeding about half the recommended dose per liter then problems started, slowing in groth and leaves dying and going crispy like in the photos. so for the past two weeks i have flushed twice with floraclean im just not sure what to do next the environment is as following

PH 6.5 tested before every watering and calibrated weekly.
Sealed grow tent
400 watt MH light in cool tube approx 18 inch's from top of plants
Water is from a bottle
Soil has no nutrients in it
Temp is 24-26 degrees
Humidity is 35-45 %

i am at week 6 now and my girls are really struggling

I want to thank any response in advance im really at a loss what to do next so all suggestions would be great thanks

Looks like Zinc def. Whats the runoff PH?..

actont said:

Looks like Zinc def. Whats the runoff PH?..

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Hi ya i have one of those photo charts and it looks like zinc, i never tested the run off, can i test it just like the water going in? should it be the same coming off?

put a litre in ..let it drain....put in cup....test the runoff.....its either zinc or PH is WAy off.

Cool i will try that in the morning Thanks for the heads up

i have the same deficiency goin not sure what it is but i flushed and started with a diff nute dyna grow bloom fertilizer we will see what happens
gl

Thats a bummer will you keep me posted an i will do the same

RH is pretty low for veg especially for seedlings

beterthanjeff said:

i have the same deficiency goin not sure what it is but i flushed and started with a diff nute dyna grow bloom fertilizer we will see what happens
gl

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Looks just like what happened to your plant

Also you said sealed grow tent as in no ventilation?

jarvild said:

Also you said sealed grow tent as in no ventilation?

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Hi i have a carbon filter to the cool tube and out it creates enough pressure to suck in a lower vent for airflow, so maybe get the humidity up to 50?

my plan of attack tomorrow was to flush and measure the ph on the run off because it looks to me from the chart i agree with the last comment it looks like zinc but i just checked the feed their and its in their so must be ph. if i flush tomorrow untill i am getting close to correct ph would i be better then giving 1/8 of the recommended feed with the last flush? or give them time to recover?