Burnt leave tips

I've had exactly the same problem, The burnt edges are usually from nutrient overload. Try dialling down on the nutrients, and feed once a week. I would go 1/2 or 1/4 of the recommended dose. Hopes this helps ya! :)

Looks like you fed them a little too much. No big deal. I burn mine a little every time. In soil it is best to feed every third watering. Water, water, feed, repeat. This will help with the burn and stop salts from building up on the roots. Autos usually won't ever need more than half of the recommended dose of nutrients. Good luck!

hey Bro ,can you post a close photo of the Tip Burns, but Generally speaking Tip Burn of the Leaves means you gave them too much Nutrients, watch the Edges if they get more and more burnt with coming days ,you can flush your system with ph water and cal-mag if it stays like that,than dont give nutrients with the next watering ,little Nut.Burn is not bad and it happens alot .

https://www.growweedeasy.com/cannabis-symptoms-pictures Try looking here. Hope it helps

It might be heat or light stress from the led’s.