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The pictures looks like the beginning of coralline algae growing on your glass. How old is the tank?
I would expect precipitating calc to end up cementing your sand together or, if dosed too high, to fall out of solution like snow. But to see it deposited on the glass, I'd be surprised...
+1 what Hawkeye said….although I don’t know what TOTM means….the only thing that comes to mind is Time of the Month. :eek:
That being said, I believe the Koralia 425s you have are “Evolution” powerheads. So they can be hooked up to a timer or controller to have them turn on and off...
The Koralia Evolution powerheads may be controlled by a timer / wavemaker function. I have a Reefkeeper and controlled my Koralias using the wavemaker function.
The no-name brand that you have, I’d be surprised if that can be turned on and off repeatedly. You need to check...