The link in my sig should help you out with most of your questions.

Don't worry at all about the ppm of promix. It is fine for plants from seed. I prefer 'faffard seedling starting mix' for the first part of the plant's life, which is from 0-5 nodes, then transplant into promix or compost + perlite for the next stage, which is from 5 nodes to sexual maturity (usually ~8 nodes or so and 6 weeks from seed), and then transplant AGAIN to flower.
stinkyattic Reviewed by stinkyattic on . Germinating, Watering, Nutrients, Soil Originally Posted by Tranoble Take a small handfull of Pro Mix and put it in a beer cup and fill the cup allmost to the top with water. Stick a PPM pen in the cup and let it sit over night. The PPM will be somewhere around 1100 PPM. That is way to much for clones. I find that they will burn and be very slow to take off. Every time I have told someone this that use Pro Mix they have come back to me and told me that I have solved alot of problems for them. Ok heres the first part, someone Rating: 5