
How is it possible? Is it possible at all or some kind of ‘dark magic’?Īctually, there is no deep secret behind it, just chemistry.Īs I have said earlier, the goal of water changes is to remove nutrients that build up over time in the tank. However, there are examples where people manage to keep their tanks without water changes for years! YEARS! This is simply incredible. Believe me, if you say on forums that water changes are not necessary, you risk starting such a that it will cover you from head to toe! I would like to start off by warning you. What if I tell you that there is a way not to do water changes? Ladies and gentlemen’s fasten your seatbelt, I’m going to blow your mind. Well,… so much that we read about aquariums is just nonsense. We have been taught these basic rules right in the beginning of the hobby. I am pretty sure that most of you do not even think another way. Therefore, water changes should not be even compared to or related to top-off. While the goal of top-offs is to replenish the water volume in the tank. The goal of water changes is to remove nutrients that build up over time in the tank. It really does not matter how many gallons (liters) you add. In general, top-offs cannot replace water changes.


People asked me why do they still need to do water changes if they regularly do top offs? Well, every time I sent them almost the same classic answer. Not long ago I received another letter (the third one!) about top offs and water changes.
