Hello Grasscity community, I'm a newbie grower and this is the third White Widow (Greenhouse) plant that I've ever grown, and also the first time with a tent and decent lighting (400 watts HPS). Let me first summarize all the specifics before I give you the pictures which show why I require some help. Pot: SmartPot 38 Liter / 10 Gallons Soil: Organic Soil Base 30 Liter / 8 Gallons: 1/3th Basic Soil The Basic soil is a mixture of: Organic Fertilizer, Lava Meal, Peat (No clue what kind of peat exactly) 1/3th Perlite 1/3th Compost Mixture (75% EWC & 25% Compost) Nutritional Amendments: 1 part Dolomite Lime 2 parts Kelp Meal 3 parts Basalt Rock Dust Lamp: 400 Watts HPS Vegetation Stage: 2 weeks 18/6 (Used the HPS lamp because I didn't have a MH) Flower Stage: Currently on day 5, 12/12 Water Information (2013 report taken off the website for water quality): pH Average: 8.42 (Very High) EC Average: 0.49 Lamp Height: 60 cm / 23.6 Inches Topping on the Soil: 50/50 mixture of: (Base soil & Nutritional Amendments) + (Neem Cake & Coco Coir) Watering amount: Every 2-4 days depending on how quickly the soil dry's. Humidity: Unknown Temperature Night: 20-22ÂºC / 68-71ÂºF Temperature Day: 26-28ÂºC / 79-82ÂºF Extra information: I sadly don't have any pH- or pH+, nor do I have any pH and EC testers. (Wish I did) As you can see below in the pictures, the new leaves have a yellowing starting from the base, and the older leaves (some deformed) also have a slight yellowing down the veins. Is it perhaps any form of deficiency, or anything else? I expect that the pH of the water that I use is just far too high, is there anything in my home which I would use to lower the pH amount down? Please share with me your insights and knowledge, thanks GrassCity!