Your other situation is primarily a pH problem. The way one or more plants have those pale green, drooping leaves at the very top of the plant is definately pH. It looks like some are worse than others. From how they look, we expect their pH to be too acidic so have some Lime or pH up on hand when you get the meter. There are other cheap ways to test it as well. A good garden or hydro store may have drops, strips, capsules, for as little as a few bucks. Once you determine the soil pH, the major nutrients that they are displaying deficiencies in appear to be N, P & Ca. They should get plenty of K all through flowering to grow large buds, so a full NPK fertilization with some Ca would be a good idea. After checking the soil pH, either give them the fertilizer mix pH adjusted to correct the soil or flush the soil clean and feed them at a normal 6.5.