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Originally Posted by robert958 View Post
What 1077 was getting at is that regular weekly water changes that are sufficient for the tank--and as I said originally, the number of fish, type of fish, any plants, size of tank all influence how often and how much water change is needed--if they are sufficient, the tank will be stable with respect to the water conditions. But not doing a water change one or two weeks, then doing a large one, can be detrimental. This is because the toxins in the water that would normally be removed every week are still there and build up; sometimes fish "manage" with this short-term and "appear" OK, but the sudden large change of water may cause the water parameters to shift drastically, harming the fish. There are several ways this can occur, I won't go into all that. Only say that regular (weekly) water changes that are sufficient in volume for the tank's biology will be healthier for the fish.
You can never change too much water. In nature fish live in water that is changing (for them) every second. Fish do not live in the same water in nature as they are forced to do in any aquarium. So the more water changes the better. However, most of us would have difficulty doing several every day, and provided the tank is balanced once a week works.
Byron Hosking, BMus, MA
Vancouver, BC, Canada
The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]
Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
I do between a third and a half water change in each of my tanks every week. My 40 gal I gravel vac every time - but I have a lot of fish in there. My water parameters have always been spot-on, and my fish are happy, so I'll keep doing it. I rinse the filter media in tank water once a month - I find it doesn't need it more than that.
Ah, the serenity......nothing more relaxing or beautiful to look at than fish gliding around their tank......
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