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The stems also look purple. Not a good thing. Do you have a PH meter? If not you need one. Coco needs to be around 5.5-6 in PH
I would not feed them again. I would flush with PH'd water at 5.6 untill your runoff water is close to that.
I used to use Fox Farm nutes. I remember they would be high in PH untill I added PH down. You need some way to test the PH in order to know how much of the PH down or up you need.
By keep adding food will not fix your problem. After you flush the Coco. Wait a day or so untill your next feed. When you do feed again, Go about half of what you did last time. You Always need to PH your nutes before you feed your plants.
I'll second the pH/ppm meter,, they're not cheap but definitely a must have. We have the Bluelab combo meter and its so easy not to have to use 2 separate meters. Now, on to what I think may be the issue. Have you noticed any pest problems? Your clones are young so I don't think flyers would be visible yet, so check the top inch or two of your coco. Dig around a little by the inside rim of your pot and look very closely for tiny fast moving crawlies. I had root aphids and the leaves looked just like yours. I hope its not the RA, but if so you may be able to get rid of them before the problem becomes a nightmare. Good Luck!
6.7 WTF??? And you are wondering why you are having problems. Read what I first wrote again. You are way too high in PH for Coco. I said around 5.5-6 in Coco. In soil you want the higher PH
Also those ph/moisture meters are not accurate at all. You need a real PH meter or you can get the liquid drop stuff to measure out. Those work better than your current meter.
Lower your PH to 5.6 and keep it there. Run your nutes at half strength untill they get in better health.
Also tell us how you are filling your res? If you just dump the nutes in and then ad water you will have nutrient fallout. You need to fill your res with water first to about 3/4 and then add 1 nute at a time, ad more water and so on utill it is full. If you do not know what nutrient fallout is, Google it
6.7 WTF??? And you are wondering why you are having problems.
yeah get your ph in check and feed them a little more. and watch the new growth you should not have no purpleing it should all be green. also them look like they may have been over watered too. i know its coco and they some say u really cant over water but can. next time wait untill they are a little bigger before you put them in those pots.
Make sure you PH your only water feed. Tap water or Bottled water is around 6.5-7.2 PH. That is why I say to lower it to 5.6 or close to it.
I really suggest you check the PH of your runoff and keep watering untill you get the PH you are watering.
Another thing which brand of Coco are you using? Alot of them have high PPM level's straight out of the bag. I have tested some at 2000 PPM's and the lowest that I have used is 50ppm's out of the bag.
Another thing also is Pre-Charging your Coco before you use it.
I'm going to go look for my spare PPM meter. You can have it if I can find it. Otherwise you can find them for around $40 for a cheapy.
Pre-charging Coco in my way is watering the Coco with PH'd water untill the runoff is around 5.6 Then I decide where I want my PPM's to be, this is where it get's a little tricky and I am ripped so try and follow. If the first week of Veg is calling for around 600 PPM's of nutes, I will make a batch around 1000 PPM's. Water the Coco again with that higher nute PPM's untill the runoff is around 600 PPM's.
From my experience doing this allows the Coco to absorb the higher amount of nutes. Coco is sort of like a sponge. It holds more water at first than Nutes if you were to feed it your regular amount at first.
Sorry this is sounding so confusing.
This isnt the greatest, but its a Hanna TDS meter for 15 bucks
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