LogFAQs > #948622404

Beveren_Rabbit posted...

I thought you're supposed to change a portion of the water every few weeks. Now I'm not supposed to change the water?

You syphon 20% of the water and replace it once a week, this is common practice to remove nitrates from the water. Maybe he means changing all of the water at once. Water evaporates but nitrates do not, only topping it off from evaporation will create a slow and poisonous nitrate environment. A weekly 20% water change is entirely safe, I've been doing it with all my tanks for 29 years.

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