I'd keep some one part fertilizer around to dose it every few waterings during bloom. You don't need much-something like megacrop, maxibloom, or Dyna Grow...2 part formulas are fine too but I just want to keep it simple for you. If you don't have any meters, just give them 1/2 what the bag says to start. At some point you'll start to notice deficiencies if you don't feed them. Nice looking plant so far though, good job! /headpat