How to cultivate the master of tropical fish in teaching. Give advice! Ruby, kiss the fish.

Cultivating nitrifying bacteria can decompose ammonia in water.

Change the water once every four days, remember to add oxygen, and the changed water can only be used for two days.

If possible, it is best to use waterfall filter and pour liquid nitrifying bacteria on biochemical filter cotton to cultivate joke bacteria. Remember, it's best to cover it up. Nitrifying bacteria hate light.