Droopy/burning leaves auto lemon 23 days old

Hey guys had a problems with my auto lemon 23 days old, it wasn't growing, not drinking water and leaves had burning. The plant looked overwatered drooping... the first runoff of my flush was 1200ppm
Just fed with water since seedling

so I flushed with 4 gallons of water at ph 6.5 the first runoff was 1200ppm.
Then I added 1 TSP Big Bloom 1 TSP Grow Big 20ml rhizotonic per gallon ph 6.5 650ppm
the run off was 350ppm (first feeding)

My filtered water is 270ppm
Temps min 21.5-max 29.4 at (25.1 ATM)
RH 34%-50%max (41% ATM)
300w mars hydro LED
Growing in biocanna soil (whitepeat/coir/compostbark/dolomitelime)
23 days from seedling

My question is:
did it need a flush cos the ppm was 1200.
Am I doing it right?
Anything else I am missing?

The only way run off ppm was 1200 was if you were feeding it. Feeding it wrong.

Autos need lighter feed. Water until 20% runoff to prevent salt build up.

Some cheap coco is full of salt. It is harvested from the sea and the salt is not washed off thoroughly.

The flush was a good idea. Start back at 1/4 strength feedings.

Feed veg nutes all the way to the end or at least until stretch is over for big autos as bloom nutes will induce early flower.

whitebb2727 said:

The only way run off ppm was 1200 was if you were feeding it. Feeding it wrong.

Autos need lighter feed. Water until 20% runoff to prevent salt build up.

Some cheap coco is full of salt. It is harvested from the sea and the salt is not washed off thoroughly.

The flush was a good idea. Start back at 1/4 strength feedings.

Feed veg nutes all the way to the end or at least until stretch is over for big autos as bloom nutes will induce early flower.

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Thanks for feedback