≈4mg
camg per gallon
Spider farmer at 4000 at 50% approx 18” away from canopy
ph is around 5.7-5.9 goin in
I feel stupid for saying this but I haven’t buffered my water nor checked ph runoff can you elaborate?
So I always preface by saying I'm a first time grower so get confirmation from the old firm. But I would suggest that is way too much light for these little guys. At this stage I had similar power LEDs 30 inches away at closer to 30%. They should be getting somewhere around 300-350 PPFD. The only way to know is to test how's much light they are actually getting. If you have a recent iPhone download Photone and check how much they're getting but I'd be moving them back to 30". Too much light will drive the plant very hard photosynthetically and push it into deficiency.
Could also be a pH issue. Calcium and magnesium are very sensitive to changes in pH and can start to not be absorbed once you leave the ideal zone for seedlings in Coco of 5.8-6.0. If using RO you need to buffer for pH or pH in the medium can start to swing wildly, as high as 10 even which is way off.
I start with RO, add 3 ml/litre of Silica (I'm in a metric country sorry haha). Allow that to dissolve for at least half hour. Test pH, will be around 10. Use pH down to get down to 6-6.3. Then add
Calmag at 2ml/litre. You could probably bring those down a bit and keep the ratios the same but these are the amounts that work for me. This will buffer your pH and stabilise it in the medium. The silica will increase the strength of your plant and protect against disease and give you massive thick trunks and branches and therefore amazing water supply. Hopefully this helps let me know if any of that didn't make sense I'm a bit blazed hehe