Rusty/Yellow color new leaves

[GCase]

Have two going Bubblelious which is looking fine. Tundra was looking great until yesterday. Noticed rusty tip on two new upper leaves. Now spreading and new growth looks to be a lighter green.

Using Root Organic. Sprouted 15 days ago and planted 19 days ago. No nutes applied. Water source distilled. No PH tested. Photo attached.

Thanks for assistance.

 

[SmashedbyHashish]

the lighter green is the start of nute def...feed em.

 

[GCase]

Thanks for the quick response SmashedbyHashish. Had scheduled to start feeding tomorrow. Will give them a snack this morning.