Originally Posted by Rayscopes
I've had tanks set up for 13 years and I have fish that are 13 years old and moved them to a new house 10 years ago. I do 30% water changes every month for freshwater and every 2 weeks for saltwater. If you allow your tank to get "dirty", you and your fish are in for trouble. If you can't afford 15 min water changes every month then don't set up a tank. If you think you need water changes every week then get a life. Just my opinion. I really don't think they're required that often unless you're severely overstocked in which case you're flirting with disaster.
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While your method will work in some instances, it won't work for all instances. It really depends on the stock you are trying to keep. ( That's not opinion BTW
As previously stated in this thread, you are changing water for other reasons than just because the water is dirty. Hopefully, your fish are getting what they need with your water changing schedule.