ok the space you have is way to small for the amount of plants you have and neither is the lighting. there is no way you are you going make it a month in that tank either. unless you do some major pruning and cutting. turning the lights to 12/12 will cause them to go into flowering and slow the vertical growing down. the general ratio is 50/50 male/female. its just like flipping a coin. this will also free up some space. the fan is an essential part it helps the plant to grow stronger stems to support the weight of the buds.