Day 55 flower Green Crack help

[Timbo0716]

Fox Farm Happy Frog
Mega Crop 5 grams per gallon
Temps running 80F day 70F night
RH 54

Watering till dry, every 3 days now. Looks like a cal-mag issue?
Anyone that can please tell me what they think?
Thanks for any replys!!

 

[mysticepipedon]

The canoeing leaves are probably from heat stress.

 

[FozzyB18]

That setup looks similar to mine, had the same issue…moved lights up 4 inches and it got better. I think cal-mag would start on the lower leafs first. At least mine did, when I had a cal-mag issue.