Can anyone Help with a Deficiency?

[IndicaPursuit]

I haven't had this one before. If anyone could help that'd be sweet. I use a drip irrigation with hydroton. Water 5 times a day for 10-15 minutes. Use Mars Hydro sp3000 LED lights. Only 3 plants have this out of 36. I just want to try to figure it out to keep it from happening to others. Thank you in advance.

Room Temp: 80°
Room Humidity: 50%
CO2: 800-1200ppm (use 5 min on 45 off recycle timer so it bounces)
Water tank temp: 70°
Water ppm: 950
Ph: yesterday 5.8, today it's 6.0

 

[IndicaPursuit]

Forgot to say. It's Day 2 of Flowering. I was thinking maybe I turned my lights up to 100% to fast. Even though they are 2 ½ ft away. But the 3 effected are all in the same row on the table. Idk. Thoughts?

 

[IndicaPursuit]

Few more pictures. Hoping someone has an idea. This happened overnight. Not sure how tomorrow will look.

 

[GNick55]

Few more pictures. Hoping someone has an idea. This happened overnight. Not sure how tomorrow will look. View attachment 1124054View attachment 1124055View attachment 1124056

reach out to @Aquaman

 

[AZLandshaper]

Bring your ph up to 6.5 and you should be good. It’s possible the light intensity was an issue but I doubt it. I’m using a lot more light w no issues to speak of. My pH is higher

 

[TripsRabbit]

Looks like magnesium, purple petioles. Are they under led? I'd give em some Epsom salt.

 

[TripsRabbit]

 

[IndicaPursuit]

Thank you for the responses. I'm going to keep that picture for future reference.