Sounds like the experiments are in progress. I will state the obvious and say, all of us, to our knowledge are keeping are nutrients in check and are resorting to Excel as a sort of final resort. Spending two hours separating and cutting BBA effected Tenellus leaves from healthy ones is not something I'd like to do every weekend.
If there's something out there that will kill the spores, bring it on. I, too, have a UVS. I'll unplug it if I try this.
Is overdosing Excel more dangerous than blasting CO2 to 40-50ppm? Possibly.
For those (over) dosing Excel, what's your "fauna" like? List casualties, if any.
Mine: Praecox Rainbows, Cardinals, Harlequins, Rummies, Amanos, Cherry Shrimp, Ottos and SAE.
For the curious, here's mine. Not terrible, more like black pepper, but better to nip it in the bud: