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a. no way this is overwatering. this is totally a ph issue b. soilless mixes are ideal for seeds if used correctly. But that ain't easy. c. let's hope so, that indeed they'll grow out of it. i'm having many seedlings that are looking like this in the coco.

soil less mixes require pH 5.8 - i am having the exact same problem now

I made the mistake of sprouting my seeds in very hard and alkaline tap water (EC 0.7, pH 7.8). Now the pH of the coco (both in runoff and in sample) is way too high (6.4-6.8)! And I can't get it down no matter how much I flush it with 5.6. My seedlings are all messed up and twisted, many...

now i found that the medium pH is too high - 6.6. no matter how much low ph solution i put through it, it won't go do.

yeah you buy it in cubes or already mixed and ready

results: the plant was removed as gently as possible from the medium and replanted in a similar medium. Both plants died shortly after. Conclusion: Better to just let them grow. Thanks everyone who tried to help.

Also, if your humidity is low, you can try foliar feeding while being careful not to get too much on the buds. only if you feel safe from mold issues.

well your quantities don't sound so much. and I think the poster above was right - your problems are likely due to the size of the pot more than anything. So I don't expect flushing and refeeding to do wonders here. But you have some lessons for next time. Pot size, and not growing plants so...

coco coir. it's not actually soil but it's much like it, only better.

flush. start feeding again at lower amounts.

yes you have the right idea enzymes will help. and so will a flushing agent. but coco is easy - you don't need 3 times the volume. to prevent salt burns from happening, feed your plants always with 30% runoff. Also, once every month or so, flush your plants with more than that, but no need for...

even if it is, you can't fix it without a ph test kit and it might be, yeah

yes but don't be extreme about it, better to do it gradually. then again, I never had much luck lowering soil pH, especially with hard water like yours that's hard to lower. If possible, get some distilled/filtered or even mineral water.

burnt is when people don't know what the problem is so they use this as a generic answer. chemical problems in the medium is the real answer. could be EC too low (not enough nutes), could be EC too high (too much nutes/time release fertilizers), could be pH off, could be that one element locks...

don't worry, you made some mistakes but you will learn and your next grows will be better. MG is not good for growing. It probably has time release ferts which are bad for the plants. If this is the case, DO NOT FLUSH. I'd stop feeding all together. Also, adjust the pH of your water to 6.5, and...

flush your soil well and start feeding again

what's in your soil? what do you feed them and how much and often? ph?

jafooli, what ppm/EC do you give your seedlings in coco?

I think this is either pH, or a genetic thing. The only nutrient burn I can see there is on the biggest plant, and that is from when it was in unph-ed tap water. then again that plant didn't have growth stunt, and is so far the best of them.

yeah but they were unhappy before the feeding as well. also, if you check out the previous grow, you'll see that what helped them eventually was feeding them. coco is not like soil you see.