Sigh Royal Gramma has Columnaris

What caused it to get up that high? I've never heard of high alk stressing out fish but I guess if it got that high it's possible. Columnaris is more a fresh water thing correct? Regardless of the diagnosis I'd do some water changes to get parameters back in line.
 
probably just a slight bacterial infection, they can clear up on their own. Had a kole tang with one that looked awful, and it cleared up on its own.
 

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