Anything with P higher than N and K..nothing is actually a wrong mixture.. it could be for example 12-30-12, 20-20-20, or 5-10-5, really doesnt matter just make sure that middle number is higher because marijuana plants use phosphorus for bud growth, K is just used to keep it healthy and fight diseases and N is used for the leaf and stem growth so it's obvious you'd want more P for buds . And what ever you do dont cut the leafs or prune now when you get into flowering because when you do your plant will use most of it's energy towards more branch and leaf production and wont be as focused on growing your buds so when ever you prune..dont do it during the flowering stage .