Even though there's expense involved, I would strongly suggest anyone dripping KW into a sumpless nano to use a medical dosing pump, which seems to be my standard response to everything these days. My pump is currently dosing 100ml (about 3 oz) per day of 2 part additive, and it is really accurate. You can dose the exact amount you want in the exact time you want; you could easily adjust the pump so that it drips a drop every second all the way to a drop every 15 minutes; that's pretty slow and there's no chance you're going to flood your nano because a dripper valve breaks.