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Looks like a nick or even tail strike from another tang.here is the photo without edits
what is "low ammonia"?0ppm nitrate and low amoonia
0ppmwhat is "low ammonia"
You normally will not see individual flukes except for a type called digeneans. One type of capsalid fluke is very large (1/8”) but they are invisible when alive and on the fish.The other dot his also buried under the skin of the fish please help @Jay Hemdal