Hi everyone, does this look like a nitrogen proble...

Do not take the other answer into consideration,or you'll mess things up a lot more. You are growing in coco, coco doesn't come with nutrients in it when you buy it,unlike soil. Especially it lacks calcium & magnesium.This is why, the CAL-MAG supplements are the base nutrients for coco,along with NPK nutes. Your plant is too young to have any toxication,with doses like 0.5ml you won't get any toxication. Do not stop giving calmag and do not stop feeding because ; bro I don't know why people here are so misguiding.Either they don't have an idea about what they are growing or they just want to get master title easy way.But they are ruining people's grows.I've seen a lot like that answer. Who told you to flush your plants at this stage ? Week 3 is still root settling, you don't need to flush plants that small. 0.5ml or 1ml whatever it is won't cause extreme nute burn.I see you worried because those first single finger leaves have burnt tips but you could have simply reduce the dosage instead of flushing. Flushing should be done in case of serious nutrient burn or preferably before harvest to help plant absorb what is build up in the media.Pale green color of your leaves come from unnecessary flushing.Since coco doesn't contain any nutrients in it, you are making your plant starve when it needs energy to establish its roots in the pot. Short answer; coco needs feeding,do not flush again please, keep giving her nutes at mild doses and do not stop feeding calmag. Your plant indeed is starving and needs some feeding. CALMAG + NPK base nutes please. I love when they say "hope this helps,happy growing" when they are probably killing someone's plants...

As mentioned in previous answer, I'd suggest stop fertilizing with Cal-mag and focusing on macro-nutrients such as Nitrogen (N) (especially nitrogen during veg to promote growth), Phosphorous (P), and Potassium (K). From this picture and the fertilizers used it seems like you also have a Magnesium (Mg) toxicity, which is another reason to drop the Cal-mag for now. Hope this helps! Happy growing :)