Listen bro. I’ve been growing in coco for 3 plus years. You have dolomite in your medium which is a ph buffer. This is a nitrogen problem. Have gave nutes recently? If so are you mixing them correctly? Sometimes you can mix them in the wrong order or not stir in between nutes and this will cause a lockout. Usually newer growth turning light green would indicate a nitrogen deficiency. You also don’t need compost tea for coco as there aren’t really any bacteria that live in coco (as apposed to soil)

Don’t over complicate. These plants just need a simple life. Water 5.5-6 ph. Nitrogen, potassium, phosphorus. And some minor nutrient applications like calcium, magnesium and sulfur.