How strong is that UV? you need at least 25 watt to really make an impression on parasites and a very slow flow in the UV, but with a large tank not all the water and parasites are going to go through the UV and those parasites on the fish are going to fall on the liverock as well as in the sand.
It is only in the free floating stage that they are susceptible to a UV and unfortunatly not all the larvaes are going to go through the UV. A lot of them are going to find a fish and attach before they get into a UV.
I had one too with my discus and always has a fluke problem (resistant to prazi) but the UV did not do much so I sold it. It was a large pond UV of 25 watts with a huge lamp and it did not work even with very slow flow.
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Originally Posted by Reefie
No such luck with that for me either. I've slowed the flow down through the UV by running it through my chiller first, and even with a gate valve. No difference for me, sadly to say.
The only good thing is that I can leave my tank fallow for as long as I want to now. ��
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