Just connected a sump with live rock from an established tank and. My tank has been running for 3 years prior to this. Still had a diatom growth for couple weeks. It dies off eventually.
I just let mine cycle through without dealing with additional cuc. Three weeks after the sump connect there is hardly any diatoms. I did syphon the sand couple times a week.
The best course of action is nothing. The diatoms are feeding on the newly introduced silicates. The sooner the silicates disappear, the sooner the diatoms will die off naturally.
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