This was a sad week. I raised the PPM too much and burned a few leaves. After noticing the burn I lowered the PPM back to 800-900. The 1000PPM is an average of the week.
I started LST but it did not work out because the stems were too thin. But now I think they can handle it.
The PPFD was close to 400 and I kept the lights on 24h to help them recover from snapping after I tried LST.
For the next week I'll keep the feeding on 840PPM and the lights 360PPFD 18h on.