I've been using Liquid Light on these guys....and it's done some funky stuff to the first set of leaves as you can see. (I asked my hydro guy about it and he said no worries so.....)

Interestingly while the Whiteberry has done real well (first pic) the White widow which gave me so much problems a the beginning has commenced to growing like a monster and has somewhat left poor Whiteberry in the dust. The WW is the second photo.....doesn't she kind of look like Popeye flexing his muscles?