Great White Auto

Doesn't look like too much nutes. That will cause burning at tips and move in. Kinda looks like calcium deficiency. It looks like some ph or heat issues on leaves in those areas. Check your ph of run off and monitor temp. If that stops it could have been minor issue being magnified by those issues. Ph can lock out cal. Dark green leaves come from either too much ph or genetics. ( if your plant has purple or blue genetics it will be darker ). I suspect yours is genetic. No clawing.

probably some time two weeks ago there was a pH fluctuation which caused the symptoms to first appear, and it's resolved now but the inertia of the thing makes it so that it sort of gets worse before the symptoms stop spreading. Nonetheless you're at a heavy light schedule so your plant needs more magnesium that's what's causing the yellowing on the serrated edges of the plant's leaf. You should probably lower the light schedule as much as you're comfortable with , the consider spraying cal mag at 1 ml / L twice a week just before "sunrise" for the next two weeks. Absorption by the leafs is 80% compared to 20% at the root level. You can probably increase your calmag to 1ml/L in the feed as well. Hope this helps ! 🚀

hey there again ! i dont like N in my cal mag at all, so for me the less the better. as long as you factor it into your feeding schedule you should be fine though. content wise cal mag is cal mag so it's down to the N difference if you like extra N or not, mine is a 000 cal mag ... hope this helps ! 🚀

more time than you want to hear.