Molasses

i believe Humbolt makes a molassis tht is just for plants and there is also a product called Cal Mag + that pbviously has calcium and magnesium in it too but it is molassis based... my hydro store recommended the Cal Mag +. check out 422 grow online and look uder their supplies section and nutrients to find info on these products and more. try this website... i think this is were 422 gets there products from.
http://www.n-g-w.com/ngw/default.aspx