I just purchased a UV sterilizer for my QT tank. I think the QT tank can benefit from a sterilizer without a doubt.

But I am on the fence about adding one to the new main tank or not.

I read something interesting about how flow rate determines what gets killed.
For example algae spores get killed easier and even at a higher flow rate while parasites require lower flow rates through the sterilizer.

One of the worries of running a sterilizer on the main tank would be that it would kill off my beneficial stuff.

I am mainly worried about algae and less about parasites since I will only make very few fish additions of fairly disease resistant fish (we have a no tang policy).

If I adjusted the low through the sterilizer for algae spores (relatively fast) - would that protect the microfauna somewhat?
Or do the little bugs suffer no matter what?