This just popped up on one of my other fish groups
So, just some information about water changes and why they are important. Large water changes should be normal for every fish keeper. Some random person came up with only doing 25% a week but for the average tank, this is not enough.
While water changes lower nitrates, which we can test for. They also do so many other things that we can't test for.
Water changes lower nitrates, organics, waste, TDS
, hormone build up, keep the pH stable (pH will rise the longer you go without a water change which makes it unstable and becomes dangerous to the fish). But they also replenish minerals and nutrients used by the fish.
So, when you think about it, only removing a quarter of the water is not removing enough and not replacing enough. Large water changes are actually good for the fish and the tank.
Bacteria is not free floating in the water, its attached to porous surfaces, so it actually has no affect on the cycle at all. You can change 100% of your water every single day and still have a perfectly healthy cycle and an even more healthy fish.