Because it was time for a water change, and it will help rid the diatoms. But after 2 days I still show little signs of diatoms again. You should try your own experiment rather than trolling me. I will continue my dosing for only a few more days because I'm going on vacation in a month, and I want my tank completely stabilized before I go. As of this time, I am not noticing any changes. I am also running a ulns Zeovit system which may play a factor. Good luck, and let us know what you find out.
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