Sick Cockatoo Fish

[johnperrins]

I lost a cockatoo fish last mouth when he seemed to have 'cotton wool' coming out of his mouth. He also had swollen lips
Another of my cockatoo fish now seems to have got swollen lips
What is going wrong?
I change 25% of my 180 litre water every week
help

John

 

[WILDER]

Cotton mouth if columnaris.
How many gallons is the tank.
How many fish and which type.
Water stats in ammonia, nitrite, ntirate, and ph.
Temp of tank.
Is your temp stable.
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