Yeah, what you did is a very effective way of instantly cycling a tank, but you need something live in there to give off ammonia for it to break down.
I would never directly feed ammonia into a tank. That just fundamentally seems counterproductive to me. In a pinch, if I couldn't add fish, I'd put in some fish food.
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 3 Planted Tanks: 10g, 20g, and 29g
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