If you have any "animals" in your tank, do not dose with ammo. They create it and will suffer greatly if you're trying to maintain a 4ppm level. Throw food, veggies, raw shrimp in as anything that decays wil feed the cycle. I know squash does since I lost a piece in my planted tank and had a small ammo spike. After I dealt with it, the spike went away.
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Oh what I was trying to say is I am trying to keep my QT alive by keeping the snails it in..not dosing with ammo...since the snails create ammo I thought this might be a good simple way to keep it alive...