what size tank to breed 1 pair convicts?

30 gallons but 20 is also possible. Add some kind of dither fish (which is why the larger tank is prefferable) so that the adults don't turn on each other.
 
You can breed them in a 10. Just use a lot of flower pots for caves for the female to hide in in case of agression. A 15g would be much better though.
 

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