Bubbleheads in BLOOM or FLOWERING CYCLE
This is a critical and important stage or cycle that will determine YIELD and Quality.
During this stage of the game, you can experiment with increasing nutrient levels, if on a high phosphorus low nitrogen nute.
PPM levels are different for CFL growers and HID light users. With HID lights you can have higher ppms. If you use a ppm meter, and stayed in the 500 to 750 ppm during late VEG, then you can get into the 800 to 1000 ppm levels now, discounting water ppm and any sups you use. Some growers with HID lights can go higher. If you do not use a ppm meter, then increase nutes every so slightly daily. Getting little yellow tips on the leaves as a sign of over feeding is not going to do a tremendous amount of harm or kill them, and is just a warning sign that you are over feeding.
You need to reduce humidity now, or if you was doing anything to increase it, like wet towels and Misting, then stop it. DO NOT MIST NOW, DO NOT FOILAGE SPRAY NOW. You MUST have and use an oscilating fan now blowing toward the tops and into the middles, to avoid bud mold. It is simple and easy to avoid, with proper air circulation. Growing in small areas and enclosed tents and cabinets is where the real danger lies for high humdiity and bud mold.
If you are growing with CFLS, you can tremendously increase yield of buds with more lights, especially by adding SIDE lights. The low kelvin bulbs help increase flower size and high kelvin bulbs increase the trichome and THC production. You also need to be bending them over to allow more light to penetrate deep into the middle of the plant. Position your CFL bulbs near the highest, biggest top to get that coke can cola you want. 42 and 65 watt CFLs can be found very cheap at Lowes, Home Depot and Walmart.
Expect to see more lower leaves die off now, that is normal.