I am going to be using fox farms ocean forest, i was told in another thread to use their own nutes so i am assuming the reference was to their 'grow big' and 'big bloom' ferts? if so, when after planting should i begin to add grow big to the water? and when after i begin flowering should i start to add big bloom to the water? should i leave any grace period in between switch ferts, or just change it suddenly one day?