Headshake has ya on the right track. :thumbsup:

I give mine molasses all the way through. 1/2 tsp per gallon per week in growth phase, 1 tsp per gallon per week in flower. (approximate NPK of 1-0-5) Feeds the plant various micronutes, calcium, magnesium, iron. Feeds the beneficial bacteria in the soil, too. Seedlings and clones get the mix once mature enough for nutrients.

I use nothing but properly ph'd water after final flushes. Ya don't need more stuff feeding the plant at this point, that's why you flush. You aren't flushing the plant, you're flushing the soil so there's less available for the roots to uptake. :jointsmile: