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I have a betta, 6 yr old, name is bubba, I noticed 2 weeks ago his fins on belly area were starting to get some red to them, now hes pure blue to start. Today when I went to feed him his monthly pea, he has a red sack now hanging from his left fin. He is well trained so I lured him to front of tank w mirror he stayed staioned enough for me to look at it and its attached to fin that has a lot red on inside and has a red ball like sack hanging. In 6 yrs never saw this. Any help with what it may be?