Help What’s Going On With My Cories Fins?

norlando097

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The other day I noticed 5 out of my 8 pans cories have white on their dorsal fins and they look like they are receding. The tank had been established for 9 months and has had the same occupants for most of that time, but about a month ago I added 4 ottos which all seem to be doing fine. There is no fin nipping going on (that I can see). Any ideas on what it is and how I should treat them.

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Sorry for the bad quality photos, they are always moving around
 

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