In hydro i just do GH Flora Trio and flush the last few days. There are products that will do something similar for hydro, like Bud Candy or Botanicare Sweet line, but i have not tried those yet. Putting molasses in a hydro setup could be problematic but can be done, so ive read, but it seems to be tricky and most comments ive read have not been favorable towards it. So ill try it in my coco plants but not in hydro until i can have enough room to "sacrifice" a plant for science. But as of now all my buds are too precious to gamble with!