Howdy Xaliuz, to convert from the measurement of teaspoons and Tablespoons (a Tablespoon is three teaspoons), use 5 ml for one teaspoon, 15 ml for one Tablespoon, and 30 ml for one ounce. When I used the un-sulphured molasses, I added 1/2 teaspoon per gallon from the grow throughout the bloom. It helped out with plant development, but in a hydroponic system it also feeds things that You do not want growing so maintaining well aerated water and keeping the temperature below 70 degrees F is necessary. I have changed to using different supplements (GH Floralicious Plus and FloraNector) instead of the molasses because they have other beneficial things in they and have done very well for me.
Good luck with Your grow.