Thinking of adding secondary canister filters to my 125, and as yet to be set up 85. I'm intrigued with the UV canister filters. Anyone have any experience with the various brands, specifically the UV operation, longevity etc.?
Don't waste your time or money with UV units on aquariums. They only kill things that pass through the UV light and most of the disease organisms remain in the aquarium water.
In addition to that, they only kill disease organisms that are exposed to the light for a certain period of time. In the filter/ UV combo units, the water passes through the UV steriliser too quickly and very few things get exposed to enough UV light to kill them.
The best way to use a UV steriliser is to have a separate model that is huge and oversized for the tank. Then put a slow flow of water through the unit and have all the tank water go through it into a sump, which then returns the clean water to the tank at the opposite end to the UV intake.
Globes last 6-18 months before they burn out and need replacing.