it is in a pH lockout

exact same think happened to mine.

your ph is super alkaline. i watered from tap, and the exact same thing happened.

get pH up and down and start watering it with pH down.

then hit it with some VERY light nutes

20-20-20 is wayyyy too much for now.

use some fish emulsion that is 5-1-1

i can show you before and after pics if u need more convincing.

the plant will grow huuuge leaves out of the new growth in 24 hours when you get the pH and lite nutes.

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How much of fish emulsions 5-1-1 should i use full strength half or what and what should i make the ph like 5.5-6.0 or what i need alittle more info thanks.

you should use 1/4 strength cuz ur plant is so small......and u need to go out and buy a ph tester with ph up and down.....thats how you change your ph and if ur gna be using tap water let it sit out for 24 hrs b4 your water your plants with it....after the 24hrs put your nutes in it then get the ph correct and then water your plants with the water.....

i think the problem started from using nutes too early, and not checking the ph of the water with nutes in it

your plant is tiny for 3 weeks, i would feed plain water, maybe a little bit of fish poop

it should shake being stunted in a week or two, but your plant is going to be surprisingly small for 4-5 weeks old

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I grow only tomatoes and for my personal use. Any inference otherwise from my posts is completely false.