Yea sorry, thats what I do too. Just hand water each site once a day for first week or 2 and by then roots have grown down good enough for flooding to take over.
I usually top feed for first week or two so roots get down to the flood level. I've pulled 1.5lbs/light with the flo n gro, with 3 plants per light, 5 wk veg. My friend regularly pulls 1lb/light with 2plants per light with 6 wks veg