Most of the times, fishes are not able to get the nutrition
they need in captivity. This is because what they eat is directly dependent
on the fish keeper. If the fish keeper always feed a certain kind of food,
then it is highly possible that the fish gets a deficiently in some nutritions.

Vitamin A Poor growth, loss of appetite, eye problems, dropsy, gill problems, hemorrhage at fin base.
Vitamin B1 (Thiamine) Poor appetite, muscular wasting, convulsions, loss of equilibrium, edema, poor growth
Vitamin B2 (Riboflavin) Cloudy eyes, blood shot eyes, poor vision, avoidance reaction to light (photophobia), dark coloration, poor appetite, poor growth, anemia.
Vitamin B6 (Pyridoxine) Nervous disorders, loss of appetite, anemia, edema, gasping, flaring of gill covers.
Vitamin B12 (Cyanocobalamine) Poor appetite, anemia, poor growth.
Biotin Loss of appetite, poor growth, muscular wasting, convulsions, skin and gut lesions.
Choline Poor growth, visceral hemorrhages.
Folic acid Poor growth, lethargy, fin damage, dark coloration, anemia.
Inositol Poor growth, dropsy, skin lesions.
Pantothenic acid Gill and skin problems, loss of appetite, poor growth, lethargy.
Vitamin C Dark coloration, skin problems, eye diseases, spinal deformities.

TREATMENT: Supplement the missing vitamin.
PREVENTION: Feed a variety of foods or commercially available brand foods of good quality