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Anonymous
>>184346
Be careful here.
Water changes are something of a "band-aid" for an improperly balanced tank. If your tank is perfectly set up (correct filtration, number and type of inhabitants, correct feeding amount, etc.) then water changes aren't needed at all. A properly set up tank is self-sufficient.
Of course, it is difficult to get everything EXACTLY correct so water changes are used to help keep the water chemistry where it should be. However, if you are finding that such massive water changes are NEEDED, then that is a sign that something is wrong with the tank, such as too many fish, the wrong kind of fish, overfeeding, a failed filter (or too small a filter), or some other problem such as a disease or contaminated water.
Think about it this way: if you have to take your car to the mechanic every once in a while, that's OK. But if you're having major work done every week, well, that's a sign that something is wrong!
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