Viewing post #447728 by psa

Actually, the copper could hurt them, too.

While there are temporary cleaning and chemical measure you can use, filtration of fish wastes is the best long term solution. Options include :

electrical mechanical filters

submerged, floating, and marginal plants

nitrogen absorbers such as small straw bales

regular water changes with non-(or de-)chlorinated water.

My favorite is option 2, but option 1 is the easiest for most people. A combination of methods is often most effective.

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