Use molasses during flush?

I haven't used any molasses my whole grow, but was wondering if it'd be a good idea to use while I flush for 2 weeks. Any suggestions?

or is there anything else that will add some weight?

It wont do anything to hurt it. Will help, if anything, but I dont know how much. Some ppl only use it the last two weeks but I personally dont think that only 2 weeks will make a huge difference. I use it the entire flower period. The carbs feed microorganisms on the roots and in the soil. These microorganisms help the plant uptake other nutes but they need time to grow for that to happen because it is mainly based on surface area. More carbs=microorganism growth=larger surface area for exchange between the mo and the plant root.