Leaves going yellow

hey there Megz, looks like Nitrogen related symptoms, but since you're actually feeding, i reckon it's nutrient lock out . Im guessing you're adding too many additives, many of which also contain N , and since there are so many products used , this adds up N and causes issues. Usually you want to use one NPK , one cal mag and one additive, right now you're using no NPK, one and a half calmag (bio heaven i think is mostly micro) , and 4 additives. So unfortunately you do need to flush and perhaps pick 2 or just the one additive, then use a vegetation appropriate NPK product. Keeping it simple produces better results. Hope this helps! 🚀