I usually start AN when the first true leaves show up! Start low and work your way up, I tend to start at around 4ml/1gal and add another 4ml every feeding afterwards until I hit my max of 16ml/1gal. Very much depends on your plant and what she wants but my base for AN, I've never used the recommended doses since I was told by a lot of people to cut it 60% and go from there. As for the PH Perfect it does work quite well but depends on what PH the water is before you add your nutrients, after mixing mine will end up between 6 and 6.5.