04-24-2013, 09:07 PM
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You can get Lake Malawi salts that are designed to buffer the water exactly like the real lake.
These also offer added protection although not a cure against scratching / ich as the water is more to their liking. Have you tested the water recently and if so, what are your parameters, ammonia, Nitrite, Nitrate?
Dosing copper is a very specialized procedure and should not be attempt unless you have a good, reliable test kit, you can crash a tank and kill the inhabitants very easily.