Radical Juice Auto by Ripper Seeds

Both are strong. Unfortunately, the new shoots have extremely yellow tips. They are actually in the biobizz light mix and have not yet received any fertilizer. I'm a little unsure where this could be coming from. Maybe dry spots? Or too much light? The DLI should actually be OK at just under 30. VPD between 0.8 and 1. 😻😻😻 Adds to Growquestion below: Tapwater at 250ppm and 25mg/l Cal + 7mg/l Mag So i add 2ml now to reach something like 90mg/l cal and 30mg/l mag 3,5L Water + CalMag 380ppm PH5.95 -- runoff 1450ppm (but its organic soil. Ec is not clear there, right?) and runoff PH of 6.02