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I run a 40 watt aqua UV on my tank and think it works great.
Brett, with or without a wiper? My used one has a wiper.
Cons:
1. If it's not a quality unit then do not bother. Maintenance and bulb replacement is required.
2. Remember it is only going to treat those microbes, pathogens in the water column, by altering their DNA either causing death or inability to reproduce.
3. Some say it also kills off the healthy zooplankton of your tank such as copepods....The zooplanton has to be exposed to the ultraviolet light for this to happen, a UV will not kill off your pod population.
Pro:
1. Increased water clarity with decreased film algae
2. Reported incidence of less severe outbreaks of disease such as Cryptocaryon irritans.
3. If it's good enough for public aquariums to use than it should not be discounted in home use as long as your get a unit with good flow and appropriate to your tank.
Good mechanical and biological filtration is irrelevant, completely different type of filtration.
A lot of people swear by them. My experience with them is on systems housing large marine mammals like SeaLions, I have never run one on a reef tank.
The only cons to a UV that I see are the cost (to buy initially, replacement bulbs, and operate) and the introduction of additional potential plumbing failure points. Pros are debatable.
And heat. [emoji4]
The only cons to a UV that I see are the cost (to buy initially, replacement bulbs, and operate) and the introduction of additional potential plumbing failure points. Pros are debatable.
I love mine for the water clarity alone. Everything else is just a bonus.
I can see a big difference in my tank when the UV is off-line.

