Blueberry Auto failing

What strain, Seed bank, or bag seed from ILGM Blueberry Auto
Age of plant 21 days
Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF Hydroponics
Vessels: Pots, Grow beds, Buckets, fabric pots Plastic Pots
PH and TDSof Water, Solution, runoff (if Applicable) PH 6.2 TDS don’t know
PPM/TDS or EC of nutrient solution if applicable Nutes at 1300ppm
method used to measure PH and TDS I use a PH pen and confirm with liquid reagent test like a fish tank test solution
Indoor or Outdoor if indoor, size of grow space Indoor in tent L2.4M W 1.5M H 2M
Light system LED, MH/HPS/CMH/Fluorescents, or other LED HLG 260 V2 RED SPEC LED
Actual wattage draw of lights 400W
Current Light Schedule 20/4
Temps; Day, Night Minimum is 11DegC and Max is 35DegC
Humidity; Day, Night Between 35% to 75%
Ventilation system; Yes, No, Size 6" Extraction fan, running through 6" carbon charcoal filter
AC, Humidifier, De-humidifier, No
Co2; Yes, No
If growing Hydro some additional questions:
DWC? RDWC? Autopots? Ebb and Flow? Other? recirculating, as picture shows
Distance of liquid below net pot (DWC) NA
Temperature of reservoir 21DegC
TDS of nutrient solution don’t know

I have now done a water change, dropped PH to 5.5 and running cal-mag with the other nutes upto 1400ppm, we’ll see what happens, thanks for everyones advice

1300 is your tds if your measuring ppm thats the total dissolved solids or ppms (parts per million) which tds is expressed in… Did i read u used a 100L of pool water as innwater froma pool ooor… Am i just stoned and missinterperted ur expressions wrong cuz ur using metric ur obviously not in usa

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Lol sorry for the confusion. I’m using a kiddies play pool, which holds 100litres of water or just over 26 US Gallons

Whoopz lol