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Hi Duzzy

A lot depends on the type of fish you have large fish which eat a lot will need heavy water changes x2 a week while little fish x1 a week. the amount of fish affects water as well, more fish more work. I do around 25% per week on average although its ok to miss the odd week I have tried skipping water changes on a regular basis but this resulted in low level nitrates which is what I wanted as the plants take it up so fast I never see it naturally. The downside to this experiment was a slowly falling pH/kH caused by the build up of acid in the water, the plants did'nt look as healthy and the fish were a bit lethargic. So decided it was better to add KNO3 and go back to weekly water changes resulting in happy fish and the plants look better.

Liz
 
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