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Fish Herder
One of my friends betta's, a small plakat, has this bright breen coloration on a part of its body where it seems the scales are broke. Any idea what it is. The bright green coloration becomes apparent when you train a flashlight on it. Wound is about 2-3 scales in size. Fish is kept alone in a divided 2.5 gallon tank without gravel or anything else in it.
