So let's say you're not using any medications, and using the TTM. Would a UV light be a good idea there? Provide any benefits worth the cost of the UV light? Then stop using the UV and treat with antibiotics or Prazipro (which says not to use with UV)?
It won't hurt anything if you're not treating with antibiotics and once you switch it off there's no problem starting ABX. I'm just not convinced that UV lights available to hobbyists help all that much with the pathogens we deal with. There's not that much research into the proper radiation dose needed to kill saltwater ich or velvet for example. The research that does exist indicates doses in the ranges way above anything UV sterilizers are rated for. That doesn't mean that it won't zap some theronts/dinospores.