Looking for some info have a 200 litre fish tank

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Looking for some info have a 200 litre fish tank and was wondering how often you should do a water change and how much should you change?

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It mainly depends on how many fish you have in the tank, what type of fish they are, and how big they are. The main goal of doing water changes is to keep the nitrates below 40ppm, so if you have a water test kit, that will help you figure out whether or not you are doing adequate maintenance on the tank. Generally though, about 25% per week should be sufficient for a lightly to moderately stocked tank, with fairly hardy fish. 50% or more per week may be required for a more heavily stocked tank, or for a tank with particularly messy or sensitive species.

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I do 30-50% 1x/week with surface substrate vac. Clean filters in tank water 1x/month. I do a deep substrate clean 1x/month as well to avoid nitrogen build up.

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Sounds like a pretty good stock level. I think 25-30% per week would probably be sufficient. If you have live plants in the tank (or if you add some later on), they will help reduce nitrates as well.

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