Malawi Freak
Aquarium Advice Addict
My rule of thumb with API has always been as soon you see any hint of green for the ammonia test do a water change and add a little ammo lock. Where I live we all have well water and it's pretty tough to get down below 60 ppm of nitrates but since I got my ro unit I have gotten that back down around a steady level of 20 in the tank.