Best type of MG soil for vegging and flowering?

Considering that my MG potting mix already contains nutes in it, will it be necesarry to add additional nutrients? I am 1 month and 2 days into the gro w and the plant seems to be doing quite well. It's about 8" or so and has a lot of inner growth that has been developing as of late. Im afraid if i don't add nutes that it will ruin the grow and im also afraid that if i don't that it may also ruin the grow. I really wish i could provide pictures of it, but i don't have a digital camera. Thanks in advance for any advice. It is always appreciated. :thumbsup: