Rusty leaves?!

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Problem: Leaves have orange splotches on the early leaves. Looks like rust. Growth continues without slowing down.

Medium/grow method: hydro/bubbleponics

Feed: and supplements used: following the captains nutrient recipe with cutting edge solutions replacing general hydro.

water source: distilled

Strain/age: Fast Buds GSC and 60day speed bud

light used: Mars hydro 300w

Climate: T: 70°-78° H: 30%-35%

Additional info: Roots looks healthy and bright white. Did a res change today. Going to be adding new intake for fresh air.
 
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:toke: hey Med'-- can you be more specific with the nutes, dosage (ppm's or EC), and especially a res' pH? Ca availability is really touchy in the optimal range for hydro,... Symptoms look like Ca defc. to me, but P can make similar dead patches sometimes,.. has there been any sudden, short term pH shifting recently? Things happen and show so fast with hydro,.. it doesn't take much! So, pending info on nutes, any Ca-Mg inputs and pH, what to next depends on what you tell me,...
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pH is at 5.7-5.9 haven't seen any big pH swings. I believe my ppm is at 700 but not sure with my ec meter. It gives me a number then says "us x10" I'm assuming I times that number by ten to get my ppm? Growth is steady and new nodes seem healthy. Only the fan leaves are showing symptoms. Will upload new pics soon
 
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