I have been very cautious with the use of molasses in doors,, and can't really say whether it is of huge benefit in coco and hydro,
But soil is a different ball game,, that's why I initially did the side by side outside on tomatoes,,so if there was any casualties it was no big deal, many people that saw my tomato crop were totally amazed,,(I somehow forgot to mention that I was trying molasses)and they all asked the same question what fertilizer are you using,,
I did and inside grow using canna Terra pro soil (cannabis) using molasses once a fortnite,, about 4 or 5 days later the plant always seemed to get a darker green colour to it and most definitely no ill effects,, but it wasn't a side by side and it was soil
with all the hundreds and hundreds of nutrient lines and the b/s additives out there for sale, that do Jack shit, a $10 jar of molasses ????