Sexing discus is extremely difficult, I would say near impossible for a general hobbyist. Someone who specialises in breeding discus and spends a lot of time with them over the years will no doubt have a better chance of differentiating between the two.
Most people who keep discus will buy a small group, four or six, of young discus and grow them to maturity. Allowing nature to take it's course and let them pair off naturally.
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Differentiating Male and Female Discus Fish
