2/7 plants are not looking so great, all 7 are 2.5 weeks old: plant 1: plant 2: Can anyone please help diagnose... BACKGROUND: temps: 70-84 humidity: 40-70% open room with constant oscilating fan on the girls they got the first watering with poland spring, that ph should be good but i did not test run off. They are all in 4 gallon pots with this soil mix: 50% Ocean Forest 30% Roots Organic 10% Light Warrior 10% Perlite they are all feminized seeds: LSD, g13 Haze, Utopia Haze, Red Dragon, Black Diesel, Bubblegummer, Sweet Tooth
Right now I'm going to say it looks like a magnesium deficiency? Here is a link to a very helpful site: http://www.marijuana-seeds.net/Thanks-ThankYou.htm Scroll down and it lists all sorts of deficiencies with photos and descriptions as well as solutions. If you read the magnesium deficiency paragraph, thats the one that seems to fit your description best.
Maybe nute sensitive, or just sensitive in general. Everything looks good though. Maybe flush it a little with unsulfured molasses 1 ts to 1 gal spring water. Could look into brewing teas in the organic forum to jumpstart the microbes. I wouldn't worry too much though. Some are just really finicky