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Corydora fin is shiny blue weird is it diseased

FreshyFresh

Global Moderator
Staff member
Hard to say. Is this fish a new addition?

Do you have readings in PPM for ammonia, nitrite and nitrate?
 

MusiCraze0

AC Members
It’s a new addition and I can’t remember the readings as I got the tank water tested at my local fish shop and the guy said it was properly cycled
 

FreshyFresh

Global Moderator
Staff member
It’s a new addition and I can’t remember the readings as I got the tank water tested at my local fish shop and the guy said it was properly cycled
It's good that you did have the water tested, but I would not trust a fish store's reading or advice (most of the time).

You need your own liquid test kit like the API master test kit to troubleshoot further. They're $25 online and last years.
 
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