hi all, can anyone help me on a few questions. Ive grown about 3 times before under fluroscents and just got myself a 400w hps light, extractor kit. i'm growing in soil and thinking about doing a scrog grow. Also i'm getting a mh lamp in a couple of days. can you help me on these please: 1. Do you need to take to ph in a soil grow and how do you do this 2. Whats the recommened size for a scrog grow under a 400w light 3. How long should i veg them for under mh lamp 4. How much does it cost to run a 400w light per week I would appreciate if someone could help me grow some good nugs many thanks 2picks