leaf tips curling up drying out and whole leaf edges tacoing a lil bit

[biggerbud420]

could this be heat stress or am i just still overwatering its mostly at the top of the plant leaves beneath look fine

? my last feeding was
promix moisture control potting mix and perlite
my lights are the top of my tent cant go up anymore about 18 inches from canopoy dimmed to 75 percent
7 tsp grow big
5 tsp epsom salt
5 tsp cal mag
mixxed in 5 gallons of water ph was 6.3 and ppm 500 ish
temps been between 85 and 72 and thats just a guess my ac infinity thermostat was messed up but i got a new one temps now shoudl stay between 78 and 68
rh has been a lil high 65 to 75 nothign i can do about it right now

 

[biggerbud420]

i have 2 plants to water and feed tonight pots are light as hell and this is how dry there medium looks

 

[BionicKroniK]

Nice grow you got there...

I'm no expert, but hopefully one of the many here on the FARM will be here soon...

@ComfortablyNumb

 

[ComfortablyNumb]

could this be heat stress or am i just still overwatering its mostly at the top of the plant leaves beneath look fine, my last feeding was
promix moisture control potting mix and perlite
my lights are the top of my tent cant go up anymore about 18 inches from canopoy dimmed to 75 percent
7 tsp grow big
5 tsp epsom salt
5 tsp cal mag
mixxed in 5 gallons of water ph was 6.3 and ppm 500 ish
temps been between 85 and 72 and thats just a guess my ac infinity thermostat was messed up but i got a new one temps now shoudl stay between 78 and 68
rh has been a lil high 65 to 75 nothign i can do about it right now

Yes, you are correct. Heat stress, Light Burn, same same...
Dim your light to 65% and cut your nutes in half the next 2 feedings, then slowly adjust up.
What are your runoff ppms?
Leave your light at 65% for the rest of this grow. You may have to bring them lower than that since you are out of room.