3 week old seedling problems

Because you are killing them by drying them out. If you want to run dry move to soil

Correct it could also be because the pots are dry before the next daily feed.

But I’m sure OP said they’re still wet when he waters again the next day.

mine are 2 and I’m working towards twice daily feeds once I organise my timer properly for the drip system.
 
Correct it could also be because the pots are dry before the next daily feed.

But I’m sure OP said they’re still wet when he waters again the next day.

mine are 2 and I’m working towards twice daily feeds once I organise my timer properly for the drip system.
Take a closer look at his second pic from the left. It's coco coir and perlite and it is bone dry. I'm shocked they are still alive.
 
Take a closer look at his second pic from the left. It's coco coir and perlite and it is bone dry. I'm shocked they are still alive.
that's because I put coco on top to fill the rest of the pot but the coco is not even slightly drying on top at all before my need feed
 
that's because I put coco on top to fill the rest of the pot but the coco is not even slightly drying on top at all before my need feed
You can test this. Divide your plants into two groups. Water and feed daily for one group, continue on with your watering strategy. You will have your answer in 2 weeks or less.
 
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