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Read more about this article here...One of the most fundamental things to learn when beginning the fish hobby is the nitrogen cycle.
The nitrogen cycle (in the aquarium) is the process which involves bacteria breaking down waste.
Firstly, you have the introduction of waste. Fish poop, uneaten food, decaying plants, dead fish, dead inverts, etc. cause a buildup of ammonia. In the aquarium you need an ammonia level of 0. In a tank with an acidic pH (under 7) it will become ammonium, which is less harmful (about as bad as...