Wat is het probleem?

She needs nitrogen so if your ph levels are now in check you can go ahead with feeding again 🌱👍

Excuse me. *Throw some... Also, with what I said there, if you can some blackstrap molasses or something similar. I'd also recommend a bit of kelp if you have some (as it can help boost the plants resistance and hormones, other than providing good trace element levels).

Through some calmag, nitrogen, phosphorus and sulphur at it. I see you got some mildew there, usually a sign of a struggling plant (even without taking environmental conditions into account). Be careful with your watering. Make sure it gets good light and that humidity isn't very high. Also make sure the plant doesn't have extended times of dryness (mildew is VERY prone to appear after a plant went through some excessively dry stages). And I would highly recommend you wipe/wash off the mildew while it's still young (you can use potassium bicarb or tartaric acid in a spray as foliar feed, which should alleviate some of that). Other cheap options for washing that off includes citric acid, sulphur, bicarb and hydrogen peroxide. Good luck.

@Uk420Show, Thanks voor je antwoord! De kokos ziet er nu vochtig uit omdat ik haar gespoeld heb😉 Anders geef ik 2x per week water+voeding en maak ik het volledige substraat vochtig zodat ik een goede afvloei heb. Ik dacht inderdaad ook dat de voeding niet goed werd opgenomen doordat mijn vorige ph meter het begeven heeft en ik dus al een tijd met een verkeerde ph voeding gaf. Nu is dit in orde met mijn nieuwe ph meter en heb ik weer 5.8 Ik ga haar nu goed laten uitdrogen zoals je aangeeft en dan de voeding stilaan terug opbouwen. Bedankt voor je hulp!👌🌱

5.8 is perfect for coco :) And yup that could be her struggling to take up her nitrogen hence the yellowing bottom leaves but if shes having trouble with that shes gunna be having trouble with all other mobile nutrients too. So NPK and cal mag need to be considered to try and get her through but in what dosage I shall leave for you to work out haha :) The medium looks rather moist XD try to only water the plant when the media is really dry that way you force her to uptake it cause she has no choice. the ph can also be the cause of your discolouration on your leaves. Though this is a second guess. Let her dry out and then try and feed her :) and see how you go :) Best of luck 👊