What is causing this? PLZ HELP



I’ve noticed that on the top of my new growth that the leaves are growing uneven on the very top on one of my plants. The tips also look bad, almost a white color or really light yellow. It’s been this way for a 3-4 days now. My medium I’m using is heavily amended and I’ve just done one feeding a day ago. The plant is 29 days old from sprout and I’ve only watered with RO water with Silica and CalMag except for my last water which I added my Grow from lotus along with the Silica and CalMag, which was one day ago. Is this a heat issue, PH issue or should I have added nutrients sooner. My medium is Coco Loco from Fox Farms and I was told it had enough nutrients for 3-4 weeks. Also, my lights just came on in the pictures so all the leaves look a little droopy from the lights off rest. Any help is greatly appreciated. Plant info below.
-29 days old from sprout
-Auto Flower
-Double Grape from MEPHISTO Genetics
-indoor grow
-5 gallon fabric pots
-lotus nutrients (only fed once, one day ago)
-Temp 75 degrees on ave
-RH 55% on average
-one circulation fan blowing
-Medium is Coco Loco by Fox Farms

morning growmie…it looks like the start of nutrient burn to me…

I thought so also, but it started before I even added any nutrients to my medium. medium is coco loco and it’s heavily amended as is. Hope I did not feed too early and make the problem worse? I’ll have to water with just ph’ed RO water and test my run off when the coco loco dries out. I have a new reliable meter arriving today.

I see lots of nutrient burn in grows with Fox Farms soils…not sure if the coco version has the same issues or not…