Plant leaves are folding slightly upwards and I'm seeing something that looks like burnt leaves. Clones are planted in rockwool and tray is filled with Hydroton. I water 5 min every 3 hours. Takes 2 min to fill. No water during 6 hours of dark. Ec is about 1. Ph is adjusted every day to about ph 6. It rises something like 0,5 every day. They where very slow in the start and they have been vegged for about 3 weeks. Res have not been changed yet. I feel that I have used large amount of ph down. It's in powder form from GH. Temps about 75f day and 60-65 night
Finaly, what can the problem be?
Finaly, what can the problem be?