Originally Posted by scootshoot
Agree with this. Less I have some sort of toxic bacteria killing off my fishies, I much prefer to do more frequent changes at 20pct 3-4 times a week as opposed to one big one.
I do agree with this on a filtered tank. On an unfiltered tank, if there are no 100% changes, ammonia builds up very very fast. it doesn't matter if you do 20% every other day. When there are no bacteria to help break down ammonia and fish waste is allowed to stay in the tank, the production of the ammonia is faster. Uncycled tanks need to have 100% changes and the substrate rinsed to get all of the nasties out. I would never have an uncycled tank with no 100% changes. All of my uncycled tanks get at least 1 100% change a week, usually with a 50% change in between.