Hi,the plants are gorilla auto rqs,19 days old,temp 28-35 degree,humidity 35-60 max.
I Fed days ago 1 liter water + Fishmix 1 ml.
Three days later,today,I Fed Fishmix 1.8ml,Top-Max 0,5,biobloom 0,5 in mineral water using pH down about 6,5-6,0.
I have to mention I use paper strip to mesure pH so It Is not Always same value but a range between 6-6,9 max.
I know some leaves are heat stressed and they are not the problem.The problem Is the progressive yellowing from bottom leaves.Take a look.
Could I use a foliar feeding of Fishmix?Which rateo per liter?
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They just look a little hungry other than that they look happy. If it were me I would just increase the strength of the feed a little and see how they react.
But I really recommend getting a proper pH meter, for me when Im troubleshooting a nutrient issue the 1st thing I need is an accurate pH reading to start.
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Sure,Today I gave in a 6-6-5 max pH 850ml solution the three biobizz nutes,in that formula,I am worried I Locked out something by pH or PPM as I have no way to see that.Also,to see what happens I Need to wait days…so I thought of giving some Fishmix with foliar spray…I don’t know,to wait or to apply some spray…To me they seem rather healthy
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They look healthy to me too man, I wouldn’t be worried.
If you gave them some food today I would wait before giving them more, see how they respond.
Personally I only give nutrients with every 2nd watering.
In soil I don’t worry massively with ppm, but definitely a pH meter.
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Looks like starting of 
, but I wouldn’t be obsessed and do drastic changes, she will be fine … 
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Those single blade first leaves on seed plants always yellow, fall off, and die. Nothing you can do about it.
Plants themselves look fine. Maybe a touch underfed and wanting more light perhaps, but fine nutritionally.
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Cotyledons aka starter leaves are supposed to die. They could use a light epsom salt foliar and a heavier Nitrogen feed, but look pretty good to me… Btw… you will always get a few yellow leaves after a transplant as well. They eat a few leaves while they are transitioning to the new medium. I just call them transplant leaves. No biggie.
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The one on the left looks like it needs water.
I judge it by how heavy the pot is, if the pot is light I water it, if its heavy leave it alone.
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Maybe humidity and water,I’ll be home in an h and I ll see if watering or eh Is the issue
I watered,noticed there were a lot of insect and prepared a potassium soap and neem oil 600 ml Tap water spray.Used 5 ml soap and 4-3 neem oil,sprayed plants being careful ti not spray too much in the soil and then put Them back in growtent,we shall see tokorrow
You were Right,watered only a Cup(200ml circa) and She Is standing again.Not phed water though
It’s too hot and dry for them, I see leaves tacoing to preserve humidity, please check this Vapor pressure deficit chart … 
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I Need to buy not expensive pH Meter and ppm,along with cheap humidifier,any link to Amazon Italy product Will be well accepted,thank everyone a lot <3
Need humidifier
Nice I have been looking for that.
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