Yellow and burnt

Hey there mate ;the plants look healthy and they could be even better by doing some tiny things. First ;the burnt tips looks like light/heat stress. With a simple phone app ; check lux at the top of canopy ;should not exceed 45000. If it does not ;then it is heat stress and you need to lower the temps to max 26 or 27 degree celcius.Second : you need to lower the ph to 6.2 atleast. This is where all the change starts. 6.5 is the border of higher range which is 5.5 to 6.5. I would say aim for 6.1 or 6.2 for veg and for flowering ;aim to get it at 5.9 of 6.0 and your plants will be loving it. Also donot forget to give pure phed 6.0 feed in between you feeding schedule to avoid salt buildup. Hope this helps.. happy growing...