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Look's like PPFD Meter app is available also for iPhone. Does any one have tried it? https://www.ppfd.app

I agree but using them in small pots helps a lot while transferring.

All the pots having clay pebbles layer at the bottom at least 1 inch. But I am always draining the cups couple hours after watering. Thanks for the advice

Yes as in my post at last cycle I flush with nutritional water to put them back. But I don't think those blocks have cal mag in them in the first place

Today my seedlings looks much better. I guess the issue was not increasing the feeding while boosting the lights... They are gaining their green colour back.

I didn't get what you mean by frankensoil Yes, I also use coco bricks. I rinse them couple times and finally boiled water to kill if there are any eggs or so. Then I flush pots couple time with PHed nutritional water.

Yes, I am using PH strips. My plain tap water is 8 PH. Adding silicate in very small quantity like 0.2g per liter drops it to 6 to 6.5 PH This also same for Dry Part, when its added I see PH stabilized around 6. Actually this is one of the reasons I like TA dry stuff, PH stops being a problem...

This is the first time I am growing in COGr which is having coco barks a you say. As structure its feeling like mixing mapito with coco. But I did grows with fine coco and perlite... Back then I was using organic stuff and had a lot of thrips. Eventually I decided to move away from organics...

Yes I have, I am using Samsung LM301B boards topped up %10 with 660nm Actually things were going good around 400 PPFD until I have watched There Dr. Bruce Bugbee says, you can shoot strong light to seedlings. When I ramp up to 700 PPFD. They either didn't liked the brighter light or its...

@Phytoplankton @bk78 I am using a custom mix as medium, those barks are like sponges and comes with COGr %20 fine coco %50 Canna COGr https://www.canna-uk.com/cogr_boards %20 Perlite %10 sphagnum moss Nutrition: Terra Aquatica DryPart Grow (aka GH MaxiGrow) Terra Aquatica Silicate Terra...

What do you think the problem is with my seedlings? They are in coco, EC is around 900 and PH 6.0