Can you judge my yellow babies?

These pics are day 17 after putting seeds in rockwool and transplanting to coco.

It's my first grow, I'm pretty sure I have optimal conditions for temperature, humidity and airflow. I have good feminized seeds and my ac is turned on 24/7 because of the hot climate where I live in. Most of the plants look yellowish and leaves are curving down. They appear unhealthy but it's hard to judge cause I'm a newb. Some strains seem to take it better than others like the 2 last pictures (pineapple chunk). I also tried different lighting for pictures to compare.


Here are 5 possible reasons where I think I could have messed up:

- The coco I used was cheap stuff that I found in a flower shop. I was in a hurry to transplant and I didn't read enough about coco (washing, buffering). I remember seeing dust while I was pouring perlite into the coco and even if I thought that this didn't look right, I still transplanted the rockwool seedlings into it. I wish I could have read what I learned beforehand and wash everything + add some cal/mag.

- My light is a Mars Hydro FC-E8000 (800w) and I used it at 25% the first 10 days of sprout. I'm not sure if it was too strong or maybe even not enough. I then dimmed it to 50% on day 11 after transplanting (cheap lux meter was reading 40k) and I bumped it to 60% (55k) on day 16. Around 30cm (12") under the light.

- I fed them a bit of cal/mag + AB on the first feed at day 14. I realized that i didn't buffer the coco with calmag at the beginning so I thought that adding a bit of it in the first feed would be good. I also read that feeding them too early is bad so this is a bit confusing. I fed them for the second time yesterday (day 16) with only AB.

- Watering times are also confusing. It seems like some people water twice a day and some people treat it like soil and wait for it to be dry. I chose every other day until i set up an auto watering system. I waited 3 days sometimes to let the roots grow, but not sure if I might have waited too long.

- I don't have a PPM meter and I am using tap water with a filter. The filter was from the previous tenants so I don't know if it's still doing a good job at filtering or if I should change it.


Please let me know what you think,
Thanks!

Do NOT let coco dry. Almost impossible to overwater especially with perlite added.

hotrodharley said:

Do NOT let coco dry. Almost impossible to overwater especially with perlite added.

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Would you water + feed everyday? Should I water without nutes and see if they become greener?

If you want to run an 800 watt light over seedlings at 50%, you probably need about 30-40 inches distance. I'd raise that light up fast, or lower the % back down. 1 foot away is way too close.

OverCloudz said:

Would you water + feed everyday? Should I water without nutes and see if they become greener?

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With nutes and at least once a day. Lots of guys go twice.

Rurumo said:

If you want to run an 800 watt light over seedlings at 50%, you probably need about 30-40 inches distance. I'd raise that light up fast, or lower the % back down. 1 foot away is way too close.

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Can we call 17 days old plants seedlings or early veg? I was using 25% dimmer for the first 10 days. I basically just followed mars hydro recommendation but i did 50% and 60% instead of 75% right away. So what would you recommend?

You should read about using coco coir medium in particular. Different mediums require different teks sometimes. Coco is inert so you need to feed earlier than in soil. Like when the seed pops and the first leaves open. By the 3rd day of sprouting is when I usually start dilute feed. Yours are hungry but will bounce back once you start proper feeding.

Mix up your nutes in the proper ratio and then dilute to the ec you want to target, until they can handle stronger feeds. No plain water, no letting the medium completely dry out.

That's all I got for ya. My time online is sporadic so I can't monitor along with you.
Plenty of great coco growers in these forums. Use the search function when you can.

I admire that you have them looking this good after 2 weeks of no nutes in coco and only a cursory feed of cal and mag.
You'll do great!! GL friend.