great wins for the slow UV!!
The UV kills everything that passes through it - especially slow with a lot of power.
You're right, a lot of things don't go through it, like adult pods and bacteria in the rocks. But the babies will eventually get zapped so you need to keep the machine going with phyto to give the survivors a leg up over the dinos.
I ran mine CONSTANTLY after the tank recovered - but I was so beaten down that I think it was out of fear and desire for vengeance
A few months later (yes - months of loathing)... I ran it at night only. This happens to coincide with when my skimmer is off too. So far, so good.