Burn spots on leaves but unsure of diagnosis

PunderTaker

New Member
Hi all, and thanks for your help.

Here are three shots of the same plant:

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I'm growing 5 Northern Lights plants in an indoor RDWC. About 5 weeks into veg stage, plants just got a second topping per the manifold/mainline technique, and a fresh rez change 2 days ago.

Feeding with GH Flora trio (10/10/5mL per gal), plus 5 ml/gal Pro-Tekt silica and 2 ml/gal Hydroguard. Using tap water that has a very high starting pH (8-9).

On this recent rez change I didn't pH balance accurately, and have been adding pH down in small amounts to get it back down to 5.8. Most recent check tonight had pH at 6.1

This is the first time these symptoms have occurred, and this is the only plant being affected. Any help on the cause is much appreciated!

Edit to say that these symptoms only showed up in the last couple of days, after the rez change and second topping. I only actually noticed it tonight.
 
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