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Tail should heal on its own. Keep eye out for tail rot or aome other tail disease. torn or disappearing betta tails sometime linked to nutrient deficiency also. Just observe and see how tail health progresses.
I'm not worried about future nutrition, he eats well and I have checked all of my foods for suitability to Betta requirements....however, he wasn't fed regularly in the child's room, which is why I added him to my community tank