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I'm a newbie as well, but from all my research that looks more like an insect problem than nute burn. What do the undersides of the leaves look like? Also what kind of lights do you have?

You can get pH meters with LCD read-outs and PH down at your local hydroponic store, or online. Aquariums/Fish stores also have pH down I believe, not sure if they carry pH meters. Edit - I've never grown in soil, but from research I think the pH needs to be around 6.5 or so.

I'm just a newbie, but it might help others answer if you include what kind of soil you're using as well as what kind of fertilizer or nutrients. How often do you water? If it's not yellow that might mean it's not being over fed, but it might be under fed or over watered. Some other facts...

Thanks :) I've been holding off on upping my nute strength for fear of nute burn, but I guess I need to feed them a little more >_< Along with Ph down, I'll add an EC or ppm meter to my list of things to buy. Anyone have any suggestions for what kind of meter to get?

First time grower and poster. My setup is pretty scrappy, but I've got 8 plants (5 an unknown strain (free seeds from website), 2 Northern Lights and 1 Super Silver Haze (purchased online)) all being fed by drip 3 times a day from one reservoir. All of them were doing fine for the past couple...