I use FFOF for all my grows. I've found that setting the pH of my water plus 1/4 strength fish emulsion 5-1-1 fertilizer to about 5.0 - 5.4 works best for me. I grow in 3 gal Smart Pots (fabric). As the plants dry out over 2-3 days, the pH seems to rise to about 6.5 - 6.8. My plants seem satisfied with that. I also add a bit of Cal-Mag (1-2 cc/gallon). I believe strongly in NOT over-fertilizing.