If the entire plant is yellowing, I'd say it needs to be fed something. Personally I don't feel comfortable using Miracle Grow stuff, but if I could make a suggestion, go to a hydro shop and get some Dyna Gro 7-9-5 and use one half teaspoon per gallon of water and give them that. Your potting might have some ferts to it, but it doesn't look like it has much. Superthrive is just vitamins and hormones, so don't expect much help there if the problem is what I think it is - low nitrogen. molasses won't do much either. It's really more for soil that has beneficial bacteria in it and I doubt if your soil does. I might be too late now to save them, unfortunately, but give it a shot if they aren't dead yet.