It sounds like your angels and discus are still small. At young ages they school nicely. When they grow up, a pair will defend a territory for the duration of the breeding . Angels and discus usually aren't kept together because the angels often bully the discus and beat them to the food. Its fine to keep young ones together, but watch them closely and have a plan to "rehome" one or the other if you have issues. Its also likely the angels will grow faster.
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