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Water from the tap contains enough dissolved solids to nourish seeds through their first few weeks of life.
Start feeding seedlings 2 - 4 weeks after they have started. You can wait until leaves yellow as a que to begin feeding though. Begin feeding with a mild 1/4th strength nutrient solution and if leaf yellowing continues, start slightly upping the concentrate of your nutrient solution.
My clones start to die off quickly if I don't feed them. I've been using a product by Humboldt Nutrients called Verde as a foliar spray and the plants are loving it. I water the coco with full strength nutrient solution(Canna coco/zym/rhizo ~850ppm) when planting from the aerocloner and foliar spray them daily(verde, rhizo). They can take full strength from there on, but only need water once a week or so and can skip a feed, but if you keep feeding them they will keep growing in coco. I tried feeding lower strength nutrients but the plants always yellow. Canna Start is a useless product in coco.
I've got a "seed starting mix" that I use for seedlings. It's a fine brown powder that will not get fully wet by itself and sucks for seeds. I mix a bit of that into mostly coco to feed the seedlings while young; they don't like pure coco so much in their infancy. Its the best way to get seedlings to a good size before feeding. I just started some without it in pure coco and they're going pretty slow and stretched out.
By the time you see yellowing leaves with its already time for full strength fertilizer <900ppm. It will take a while before you choke the plant out with nutrients in coco. Try that Verde and seed starting mix, its the best combo I've found so far.
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