Join Date: Feb 2007
Location: Connecticut, USA
In my high fishload fairly heavily planted 10g with 28 watts and DIY CO2 (30ppm via drop checker), I add 1/8 teaspoon KNO3 and 1/16 teaspoon of KH2PO4 and K2SO4 every other day. The nitrates stayed at a constant 15 ppm and I had some green spot algae, so I upped the phosphates to 1/8 teaspoon as well.
Not even close to your lighting, but I thought I'd post it.
EDIT: Oh and 2 mL of Flourish every other day (off days from macros)