my fire mouth was badly beaten like this one, in just a few hours by the male. I put her in her own 10 gallon tank and she also did nto eat. after several days her fins grew back, and she healed up nicely. but still no eating. I took the male out and she went back into the 55 gallon tank. she is very happy now and eating great. and she was near death! so yes, she will heal if you leave her alone, make sure there is some java moss or something for the fish to hide in, and subdued lighting.