Join Date: Nov 2011
Location: SF East Bay Area
My first bet is the low GH, not N.
I would raise it to ~6 using baking soda (look up how much you need per gallon to go up 1). There are also several versions of GH Booster available on the web.
Courtesy * Integrity * Perseverance * Indominable Spirit * and Self Control
Tenets of TKD