lwhats this?

[demcc3]

Hi everyone. This is one of my Blue Dream autos. Can any of you tell me/suggest what's possibly wrong here (leaf tips curling and leaves as a whole are lighter but have slightly darker veins) Is it a Cal Mag issue, nute burn, nitrogen toxicity, a watering issue or ALL of them ? :

Thanks!

[crucialbunny]

Check your PH. Could be your plant isn't able to absorb iron because PH is to high.

[Gluteous]

What are they in? What's your watering/feeding schedule? Looks to be a PH or over-watering issue.

[Alik92]

When you are suspicious of those 2 problems, how should you proceed? Sorry to invade this thread, i have that doubt and it may help the original post owner aswell!!
Should a person wait the pot to dry to avoid any mold/rot first and act on ph later, or quickly act on ph regardless of the overwatering possibility?

[demcc3]

I'm growing in 75% Promix HP and 25% Coast of Maine Stonington Blend with a couple of handfuls of perlite. This is my very first time using any type of Promix. They're in 5 gal pots. I've been watering about every 10 days (yes, going off weight of pot). I'm feeding it with Green Planet Medi One every other watering

[Gluteous]

Doesn't sound like you are over-watering then. The PH needs to be correct regardless of your watering schedule and should be the first thing checked/fixed for any type of issue. Check and adjust PH for both watering days and feeding days and check/adjust the PH after adding nutes to your water.