You need to quarantine the male for at least 30-90 days before introducing with existing reptiles.
Also keep in mind the male and the female will breed, and if the male is substantially larger than the female, he may easily bully her and stress her out.
If you intent is ti breed, leave them together long enough to do their business, but I'd recommend leaving them separate for most of the year. Bearded dragons do best when housed individually.
These lizards have unique personalities. Basically, keeping both in the same enclosure can be really hard at times - talk about bullying each other (since you have a male and a female).
There must be at least one hiding place for each dragon in the form of logs, sheets of bark pipes etc.
When your new male dragon exhibits this hard attitude over time, you must house him in a different enclosure, away from the female.
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