5.9 is what i go for. i use the advanced #4 its the best. part coco and mycorr charged.
sunshine advanced mix #4 is meticulously formulated to meet the needs of professionals, yet easy to use for beginners. sunshine advanced mix #4 is made with canadian sphagnum peat moss, coarse perlite, coconut coir pith (coir), and organic starter nutrient charge that contains gypsum, dolomitic limestone, and organic wetting agent plus a plentiful helping of multiple strains of mycorhizzae for improved nutrient and water uptake, and better resistance to stress and disease