I've been using biobizz grow up to now, the guy at the hydroponics store insisted biobizz nutes would be fine with the gold labels buffers. I've also been using a little coconut water for the plant hormones that it contains, but i doubt thats the problem because its so mild in concentration. I also think it may be worth mentioning that im growing in coco but hand watering, I don't have a hydroponic watering system in place, But as far as i was aware that isn't a problem with coco. I have more leaf tips turning upwards so maybe thats a good sign as previously mentioned, Im going to see if the next couple of days show any positive signs and just feed water, Im sure the nute burn is spreading despite folks saying the plants looked starved.