hard for me to tell if it's a hybrid or indica/sativa.....it's early yet for that, plus this is my first grow as well....your soil must be good....as long as it is ph balanced and drains well...i use soil more or less the same type like yours, for flowreing plants like geranium....so far have not faced any problems at all.....first time i used ferts was during the 5th week from seed, was into last week of vegetation....anyway....do not overwater and do not use any ferts if the plant does not show u signs that it needs them....you will know what your plant needs only by looking at it.....if you have any further questions ask