My test kit ran out probably a year ago. I do what many fishkeepers do, even if they have a test kit but aren't in the habit of testing.
-I follow an aggressive water change regimen. Depending on the tank I do 50-70% weekly, every single sunday. If I miss one I double up the next week. I also do weekly gravel vaccuming on my Oscar's tank.
It's excessive, but it keeps my fish healthy, has worked for me in the past, and puts me nowhere near the "danger zone"
The fact of the matter is, it takes just as much effort to do a 25% water change as say a 75% water change. That is unless your still doing it caveman style (like I used to) with a 5gal bucket.
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