To me it looks like a scrape/cut of some sort. If this is the case the melafix will help heal the tail in about a week. It sort of looks like she got her tail caught or stuck on something and ended up hurting herself pulling free. I can't say for sure but I hope the melafix works for you, it has helped my FW fish in the past.
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One more fish should be ok?, right!!!  - Laurie
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