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It just appeared recently. The tank is a 20 gallon. I have a hanging filter on the back. I replace the the filters once a month. I do 25% water changes once a month also. I haven't added any new fish, rocks, plants or decorations. I have hard water ( well water) I don't add any chemicals. There...

My swordtails have bubble like lesions on their tail fins. I got the best pictures I could.