Looking for help/suggestions identifying leaf issues.

[BrokenHome]

Hey gang,
First hydro grow. Top leaves are spotting. Can anyone identify the issue by sight? The ph for the entire grow has been between 5.4 and 6 (usually stays around 5.5), so no big swings. The humidity did jump way up for a bit due to rainy weather. There are 3 plants in hydro all showing signs on top leaves. I have 2 autos flowering in soil in the tent also and they do not have any of the issues. Thanks for looking and for your suggestions.

 

[SofaKingHigh]

Give some more info on the grow. What are you growing in and what light are you using. How far is your light from the plant?

 

[BrokenHome]

Hydro system. Jacks 3-2-1. Growers choice e720 w/UV (under 70% power) 18-24in. above canopy. There is a large tower fan, a fan above the light, and exhaust fan in the tent.

Could high humidity cause this issue? It has been way too high lately and the one area I know has been off.

 

[Pushrod Monkey]

What EC is your feed going in? Looks like calcium deficiency. Burnt serrations appear potassium deficiency. Suspect phosphorus deficiency as well. Are you using the mag sulfate?

 

[BrokenHome]

EC 2.4 or ppm500 1150

 

[BrokenHome]

I have been following this feeding schedule.