As I recall, my post, regarding adding carbs to your nutrient mix, stated that it isn't necessary or beneficial unless the plant is starved for sugars. I grow my plants in raised beds that get large helpings of mulch/compost each season. Bacteria and earthworms convert this to a plentiful source of carbs. I don't believe molasses is a good replacement. The one season I used such products(in retrospect, probably too much) my plants became sickly late in veg, and produced less than expected. I've stuck with my mulching since and experienced excellent results. At this point, everybody seems sold on using these high priced products. If you're happy with the results don't let me stop you. I just think the science is a bit iffy. BTW, I was one of several to try those products that year(2008?) and none of us had positive results.