36w uv sterilizer on 200 gal still have fungus growth

Red_Man

Plecostomus
MFK Member
Sep 14, 2010
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Fungus on your fish? Even with UV they have specified flow rates to kill certain things. Check the manual to see what you need to be flowing through the UV to get desired results. If you cram water through them they have little to no effect. Sorry I don't have a more specific answer. I know a handful of people that just stuck the UV in line with the return pump and where flowing 3x the recommended rate to achieve anything except some minor algae control.
 
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freshfishin727

Jack Dempsey
MFK Member
Mar 11, 2011
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St Louis
200 gallon tank
With 50 gallon sump
Sump is running 2400 gph through a berlin sock and then into a k1 reactor holding 2 gallons of k1
I have a cannister filter pulling water out of the final stage of my sump , the canister filter is filled with anerobic-bacteria bio media like bacteria house and bio home , and then before being returned to the sump it goes through a 36w inline uv sterilizer, the return from the cannister is approximately 200 gph from what I calculated after timing it to fill up a 5 gallon bucket.
The tank has 1 inch black sand
And one single piece of drift wood
1 20 inch endlicheri
2 15 inch lapradei
5 angel fish
1 9 inch african aro
2 10 inch tarpon
1 8inch african pike
1 10 inch male marbled motoro

Ammonia 0 Nitrite 0 Nitrate 20-30
50 gallon water changes 3 times a week
We need more info.. Water parameters, tank size, fish etc
 

freshfishin727

Jack Dempsey
MFK Member
Mar 11, 2011
132
72
31
St Louis
My tarpons both have it on their bottom lips and my lima shovel nose has it on the top of his head, seems like the shovel nose scraped his head on something prior before the wHite appeared and the tarpon have alway had a lil ball on their bottom lip from rubbing against the tank but now it's white.
Which fish has the problem?
 

Drstrangelove

Potamotrygon
MFK Member
Oct 21, 2012
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San Francisco
A UV filter is designed only to kill free floating organisms. It's preventative. Algae, bacteria or parasites that exist in the water column will in theory float through the UV filter sleeve, have their cellular DNA damaged beyond their ability to self-repair and then be unable to properly reproduced.

However, in the case of infections that have entered a fish's body or tissue, a UV filter isn't of much use. (Think of influenza: washing your hands and covering your mouth is effective until you actually contract influenza, then it's next to pointless.) At that point you need to identify what is the cause and take appropriate steps.

You might want to post a picture of the infection in the disease forum and get some specific advice on treatment.
 

duanes

MFK Moderators
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Jun 7, 2007
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Isla Taboga Panama via Milwaukee
Agree with Drstrangelove, unless the pathogen passes thru the UV unit, it will not be killed.
And unless it goes thru the unit at a slow enough speed to damage the cells, it will not be killed.
 

freshfishin727

Jack Dempsey
MFK Member
Mar 11, 2011
132
72
31
St Louis
Alright I get that, but I had this tank setup with a uv for 1 year can fish with no signs of fungus introduce an outbreak? And Im just gonna use salt to treat it,how much api aquarium salt should I use per gallon
 
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