How can I minimize ammonia in my tank?

Ammonia most popular home: question : How can I reduce ammonia in my tank I do not have an ammonia tester, they are my Aquarium.Bisher one of my goldfish black Flecken.Wie I can develop ammonia? I water about 50% each Samstag.Ich do this since they started development of black spots. &; What is the cost of ammonia tester that I Sache.Idk carbon filter what that means, but it deals with something Kohlenstoff.Ich Best answer: ? response Sarah I recommend on. How do you know that the

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