I did start of by giving them 2 dessert spoons in 3 litres of water each week into my soil.
However this i felt made the soil smell a bit to much like molasses which i didnt like so i switched it to only 1 dessert spoon a week in 3 litres of water which seemed to work just fine.
Also seems to me that having the soil smelling to much like molasses can attract bugs so be prepared for that with fly strips or trap dishes.
As far as i know molasses is not suitable for hydro or aero grows only soil
