if u havent done hydro before, id say go with General hydroponic's Floranova series ferts, grow and bloom. then use there Koolbloom later in flower. can use some florakleen to prevent rots and algae buildups.
dont fertilize till the plants are established . its best to grow clones in hydro than seeds.
"An ounce of prevention equals a pound of cure."
treat it before u get it