5 is a bit too sour and you certainly don't want to start having issues toward the end of your grow. I would slowly ph your water/feed up until your run off gets to at least a 6 or better.
I'm new to all this and I wonder how can you determine precisely when your plants start to flower when growing outdoors. I see my plants sprouting white hairs up the sides of the branches but no distinct hairs from the tops of the bud sites. I have several different ages and strains going right now. All of them in different stages of development. I have never found a answer about when you determine when the plant goes from preflower to flower. I myself have thought that when the tops of the bud sites start developing hairs, that's the start of flowering. I know it's best to harvest when they look ready instead of going by how long that particular strain is supposed to flower for. I'm just kinda curious about this, do you happen to know more about what the signs are for a plant that has started to go from preflower to flower? Thanks