Hey guys, so my plants are in trouble - As of 3 days ago, they started showing these weird squiggly yellow symptoms. I thought it's a magnesium deficiency at first, as my coco runoff read at 5.6PH. I started switching my PH up, went from 5.8 to 6.1, 6.0, trying to stay in the hydro range. It sadly didn't help, it keeps spreading.
I am using Plagron Coco Perlite, it's prebuffered, washed, runoff EC of clean coco was 0.01, which is 100% fine. I mixed this with a bit more perlite to make this substrate ready for multiple fertigations, in my case 2 fertigations per day.
To this, I use RO water (0.01EC), Cannna Calmag Agent, and Canna Coco A/B nutrients. I add 0.4EC / 200PPM of Canna Calmag Agent to the RO water, stir, wait, then add Canna Coco A, stir, then Canna Coco B, stir. I then check EC, which should be at around 1.7EC. After that, I check PH, usually floating at around 4.8PH as I'm using RO water. I then use Canna PH+ (5% potassium hydroxide), around 1 drop is enough to get my solution to 5.8PH.
I then use this nutrient solution by adding it with a 30ml syringe at the rim of every plants cup, until runoff. 30ml is usually enough. I currently do this twice a day. They aren't drooping, they're not overwatered, they just have these weird symptoms of weird yellow lines that I can't find the cause of. I tried fixing this by raising PH slightly, but it didn't help at all, it becomes more and more.
Temps are in the 79-82°F range, humidity around 65-70% as soon as the tent is closed. Oscillating fans, exhaust fan, everything is working as expected. Light is a MarsHydro FC6500-EVO, currently running at around 30%, PPFD is at ~280-300, 24/0 cycle. These are Speedrunseeds Autoflowers.
I use an Apera PH60 pen, 100% calibrated, stored in KCl solution after every use. Gets washed in RO water before- and after every use. Same for my EC pen, a Milwaukee Instruments T75.
Does anyone have an idea?
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