advice please, some edge curling and yellowing or burn tips. 4 weeks old.pics

I have 4 week old crystal rain in dwc in 5 gal buckets with 3 1/2 gal of nutes GH flora, micro , bloom with B52. I'm using tap water w/vita grow to remove the chlorine and chloramine. Yesterday I changed them all and today I see a few issuse.I did not add any Cal mag this time. I am very please with growth at 4 weeks old as they are very bushy and dark green.I'm using 3. 240 blackstar LED'S and 4 150 soft cfl's so light burn should not be any concern. I topped them on Monday and thought it might be just stress on the culing?Maybe its the strain. Here are my babies please advise

Also ph is around 5.8 and my ppm is about 750.

upward "tacoing" of leaves is an indicator of high heat and/ or humidity.

My rh is 60- 65 and temp is 75

I agree with superstoner on symptoms and the cause. High heat is the usual culprit at this time of year.