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Females will start to hit maturity anywhere from 9-14 months; males can take a bit longer. It is not uncommon for two young females to pair up together, so don’t assume just because two of your young fish are together and one is laying eggs, one is a female and the other a male. There are many myths out there regarding how to successfully sex discus, but the most reliable is to have a good look at the breeding tubes (and even this sometimes fools even the most advanced hobbyist). The female breeding tube (ovipositor) tends to be larger and blunt at the tip, while the males are smaller and comes to a point.
https://www.discusnada.org/breeding-discus/