I thought happy frog only came in soil? 5.6 is the low side for coco though. If you are growing in coco then you want to run close to 6. If you are in soil you are safe from 6 to 7. Dont stress yourself trying to up and down it to get to an exact ph as long as you are in range. Different nutrients absorb better at different ph so there is really no perfect ph. But nutrients start getting locked out when you get too low or high