when i start feeding them the ph will be reduced i suppose from the nuts in the water....i am going to do so in a few days time as i can see the first two leaves getting a little bit yellowish....in that way i believe that pH will be around 7 almost neutral.....so far as i can see they have started to grow the third set of real leaves and they seem to grow faster than before....i watered them after almost 3 days and right now my lights have come up again...time to check them out...