So, something has happened, thinking it's eit...

Hey there Red, yeah man of course it's saveable, veg is great because veg is veg and the plant will recover, eventually. So basically you have a standard calcium deficiency, even though you're in soil for two reasons. First, the light schedule is too intense so the plant is going into overdrive and it simply cant absorb enough calcium through its roots. Second, I see you're not checking the pH of the feed, this is going to lead to such problems , for example the rooting agent you're using is going to raise the pH of the soil and this will cause problems. The solutions are simple though, so no worries ! first get some cal mag and add it to the feed every now and then , use the cal mag as a spray 2ml / L . the spray will help the plant get better quicker because absorption through the leaves is much quicker than through the roots. And finally get some cheap pH strips so you can pH your waterings : you're aiming for 6.0 in soil. (pH of rain water is 5.5. ) By the way i wouldnt flush, a flush is actually a pretty stressful thing for a plant, there's no need. If anything you could reduce the light schedule to reduce the stress on the plant. One last thing: dont feed every time ! you should feed once every three waterings ! hope this helps ! 🚀