Canmanak Posted April 7, 2021 Share Posted April 7, 2021 (edited) Hi. I have 4 emerald Cory's in my frog tank that have been there for 6 months. One of them has gotten a black area on his fin that was not there before. All tankmates happy. Any ideas what it could be? Edited April 7, 2021 by Canmanak PIC Link to comment Share on other sites More sharing options...
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