I was wondering the same thing and was really drawn to the idea of molasses so i added some to my res. after doing so, i would not recommend it. first, molasses has a big effect on ph. if you get the right amount in there and manage to balance the ph, it actually stabilized for me for a while, but the risks aren't worth it. if you have too strong a concentration or your ph gets out of whack, your res will get really funky really quickly. what i would actually recommend is getting a gal container and filling it with as much 1tbsp/1gal concentration as you'll need to semi-flush your plants by hand every once in a while. i think it is good during later flowering when nutrient uptake is critical. just my 2 cents