Originally Posted by SKAustin
Mark, Just a quick Q on your use of UV. Have you noted any negatives to it's use? I personally don't use one, but have considered it. My hippo tang occasionally gets spots of ich among other things, but so far I've been lucky and it's cleared up in a day or so. Usually when I go messing with something in the tank, she pops up with it again for a day or so, but otherwise, she's fine. I have the UV here, just never got around to hooking it up. I don't know if I really want to go hooking it up if I don't need to. But I'm curious as to any obvious pitfalls to using one.
This is such a touchy issue i almost decided to message a response offline. But I decided that any free exchange of ideas is worth talking about.
So... warning to the reading. THE HOBBY DOES NOT AGREE WITH ME.
So, here goes. I do not buy into the concept that a UV is damaging in a reef system. I would challenge anyone to provide concrete evidence. My system is full of copepods, amphipods, feather dusters and spionid worms. I do not believe that anything beneficial to a marine system is floating in the water column. The UV can only kill what floats and is sucked into the intake.
In fact, i would suggest the opposite to be true. If it floats, it is bad. The UV kills water born bacteria, pathogens, and parasites that are responsible for the spread of disease in the aquarium. It also eliminates any water born dinoflatiglates that could tint the water and reduce light penetration.
(Off topic... I also believe the UV usage goes hand in hand with carbon, which removes acids that tint the water and reduce light penetration.)
That being said, I do take a few small precautions, just in case i am wrong. I use a very slow flow rate threw the UV, increasing the likelihood that what passes thew the unit is actually killed. I also only run the UV for 12 hours per day. I have it timed to function like the tides... only without the seasonal changes.
Honestly, i can not even begin to express the quality of success I have seen in systems with UV's as compared to those without. At this point in my fishkeeping life, I won't even set up a delicate FW system without one.